Clinical Nutrition Quick Answer: Postnatal depletion — the cumulative nutritional, hormonal, and nervous-system drain following pregnancy, birth, and fragmented sleep — shows up across ten recognizable signals, from unrefreshing sleep, "mom brain," and hair shedding to afternoon crashes, sensory overwhelm, low libido, and normal-looking basic labs that missed ferritin or Free T3.
Introduction: When "Normal" Postpartum Exhaustion Becomes Something More
"It's normal. You just had a baby."
How many times have you heard that? From your doctor, your mother, your friends, even strangers at the grocery store. And yes, some level of tiredness after having a baby is expected. But what if what you're experiencing goes far beyond normal?
What if you're two years postpartum and still can't remember simple words? What if you're getting eight hours of sleep but waking up exhausted? What if you've tried "everything" and still feel like a shell of your former self?
Here's what no one tells you: up to 50% of mothers experience postnatal depletion, a state of physical, nutritional, and hormonal exhaustion that can last for years if left unaddressed. It's not postpartum depression (though they can overlap). It's not "just being tired." It's a real, diagnosable condition with specific symptoms and, most importantly, effective treatments.
I'm Yarden Konki, a Certified Functional Nutritionist and Postnatal Depletion Specialist based in Los Angeles. After experiencing my own postpartum struggles and working with hundreds of depleted mothers, I've learned to recognize the signs that distinguish normal postpartum adjustment from true depletion.
In this article, I'm going to walk you through the 10 most common signs of postnatal depletion. If you're experiencing three or more of these symptoms beyond the first few months postpartum, it's time to take action. Because you deserve to feel like yourself again—and with the right support, you can.
What is Postnatal Depletion? Understanding the Condition
Before we dive into the signs, let's understand what postnatal depletion actually is.
Postnatal depletion is a term coined by Dr. Oscar Serrallach, an Australian physician who specializes in postpartum health. It refers to the physical, nutritional, hormonal, and emotional exhaustion that occurs when a mother's body hasn't fully recovered from pregnancy, birth, and the demands of caring for a baby.
The Science Behind Depletion
During pregnancy, your baby takes what it needs from your body—whether you have it to spare or not. This includes:
- Minerals: Calcium from your bones, iron from your blood, zinc, magnesium, selenium
- Vitamins: B vitamins (especially B12 and folate), vitamin D, vitamin A
- Essential fatty acids: Omega-3s (DHA and EPA) from your brain tissue and nervous system
- Amino acids: The building blocks of proteins, taken from your muscles and tissues
- Micronutrients: Iodine, choline, and dozens of other nutrients
After birth, if you're breastfeeding, this depletion continues. Your body produces about 25-30 ounces of milk per day, which requires significant nutritional resources. Each ounce of breast milk contains approximately 20 calories, along with proteins, fats, vitamins, and minerals—all drawn from your body's stores.
If you don't adequately replenish these nutrients through diet, supplementation, rest, and self-care, you become depleted. Your body goes into survival mode, prioritizing only the most essential functions. Everything else—energy, mental clarity, mood regulation, immune function, hormone production—suffers.
How Long Does Postnatal Depletion Last?
Without intervention, postnatal depletion can last for years—even 5-10 years after giving birth. Many women don't realize they're depleted until they have a second or third child and their symptoms become severe.
However, with proper nutrition, targeted supplementation, adequate rest, and support, most women see significant improvement within 3-6 months. Full recovery typically takes 6-12 months, depending on the severity of depletion.
The key is recognizing the signs early and taking action.
Sign #1: Persistent, Bone-Deep Fatigue That Rest Doesn't Fix
What It Looks Like
This isn't the normal tiredness of caring for a newborn. This is a profound, unshakeable exhaustion that doesn't improve even when you get adequate sleep. You might sleep for eight hours and wake up feeling like you haven't slept at all. You feel tired in your bones, in your cells. Getting through the day feels like wading through mud.
You might find yourself:
- Needing to lie down multiple times during the day
- Feeling exhausted after minimal physical activity
- Struggling to stay awake during the day, even after coffee
- Feeling like you're "running on empty" constantly
- Experiencing crashes in energy that make it hard to function
Why It Happens
Persistent fatigue in postnatal depletion is caused by multiple factors:
- Iron deficiency: 30-50% of postpartum women are iron deficient, which directly impacts oxygen delivery to cells and energy production
- Thyroid dysfunction: Postpartum thyroiditis affects 5-10% of women, causing fatigue, weight changes, and mood problems
- Adrenal exhaustion: Chronic stress and sleep deprivation deplete cortisol and other stress hormones
- Mitochondrial dysfunction: Your cells' energy factories aren't working efficiently due to nutrient deficiencies
- Chronic inflammation: Ongoing inflammation from poor diet, stress, or underlying conditions drains energy
What Makes It Different from Normal Tiredness
Normal postpartum tiredness improves with rest and gradually gets better as your baby sleeps more. Depletion-related fatigue persists regardless of sleep, often worsens over time, and doesn't respond to typical interventions like caffeine or naps.
What to Do
- Get comprehensive blood work including iron panel (ferritin, serum iron, TIBC), complete blood count, thyroid panel (TSH, Free T3, Free T4, antibodies), vitamin D, and B12
- Work with a practitioner who understands postnatal depletion to interpret results and create a treatment plan
- Prioritize iron-rich foods (red meat, liver, dark leafy greens, legumes) and consider supplementation if deficient
- Support adrenal health with adequate protein, regular meals, stress management, and adaptogenic herbs if appropriate
Sign #2: Brain Fog and "Mommy Brain" That Won't Go Away
What It Looks Like
You walk into a room and forget why you're there. You can't remember simple words mid-sentence. You struggle to follow conversations or retain information you just read. You forget appointments, lose your keys constantly, and can't seem to focus on anything for more than a few minutes.
Everyone jokes about "mommy brain," but this feels different. It's not cute or funny—it's frustrating and sometimes scary. You feel like you're losing your mind, like you're not as smart as you used to be.
Why It Happens
Your brain is an incredibly nutrient-demanding organ. It uses about 20% of your body's total energy and requires specific nutrients to function optimally:
- Omega-3 fatty acids (DHA): Essential for brain structure and function, heavily depleted during pregnancy and breastfeeding
- B vitamins: Critical for neurotransmitter production and cognitive function
- Iron: Necessary for oxygen delivery to the brain
- Magnesium: Required for hundreds of brain processes
- Choline: Essential for memory and cognitive processing
When these nutrients are depleted, your brain literally doesn't have the raw materials it needs to function properly. Additionally, chronic sleep deprivation, hormonal changes, and stress all contribute to cognitive impairment.
The Science
Research shows that pregnancy causes structural changes in the brain that can last for years. While some of these changes are adaptive (helping you bond with and care for your baby), nutrient depletion can impair cognitive recovery.
A study published in Nature Neuroscience found that pregnant women experience significant changes in brain gray matter that persist for at least two years postpartum. When combined with nutritional depletion, these changes can manifest as persistent brain fog.
What Makes It Different from Normal Forgetfulness
Normal "mommy brain" is mild, temporary, and often related to sleep deprivation. It improves as your baby gets older and you get more sleep. Depletion-related brain fog is severe, persistent, and doesn't improve with rest. It can actually worsen over time if not addressed.
What to Do
- Supplement with high-quality omega-3s (at least 1000mg DHA per day)
- Ensure adequate B vitamin intake through diet or a B-complex supplement
- Check iron and thyroid levels (both directly impact cognitive function)
- Eat regular meals with adequate protein and healthy fats to stabilize blood sugar
- Consider phosphatidylserine and other brain-supportive nutrients under practitioner guidance
Sign #3: Mood Swings, Irritability, and Feeling "Not Like Yourself"
What It Looks Like
You snap at your partner over small things. You feel overwhelmed by minor inconveniences. You cry easily, sometimes for no apparent reason. You feel disconnected from yourself, like you're watching your life from the outside. You might feel anxious, depressed, or just emotionally flat.
You love your baby, but you don't feel the joy you expected. You're going through the motions of motherhood, but you don't feel present. You wonder if you'll ever feel like yourself again.
Why It Happens
Mood regulation requires specific nutrients and balanced hormones. When you're depleted, several systems are affected:
- Neurotransmitter production: Serotonin, dopamine, and GABA (your "feel good" chemicals) require amino acids, B vitamins, magnesium, and iron
- Hormone balance: Estrogen, progesterone, thyroid hormones, and cortisol all impact mood and are often imbalanced postpartum
- Blood sugar instability: Skipping meals or eating poorly causes blood sugar crashes that trigger mood swings
- Inflammation: Chronic inflammation is linked to depression and anxiety
- Gut health: 90% of serotonin is produced in your gut; poor gut health directly impacts mood
Distinguishing Depletion from Postpartum Depression
This is important: postnatal depletion and postpartum depression (PPD) are different conditions, though they often overlap.
| Postnatal Depletion | Postpartum Depression |
|---|---|
| Physical exhaustion with mood changes | Persistent low mood with or without physical symptoms |
| Responds well to nutrition and rest | May require therapy and/or medication |
| Mood improves with proper nourishment | Mood persists despite physical improvements |
| Irritability and overwhelm are primary | Sadness, hopelessness, and detachment are primary |
| Can contribute to PPD if untreated | Can be worsened by nutritional depletion |
Many women have both conditions. Addressing nutritional depletion often improves mood significantly, but professional mental health support may also be needed.
What to Do
- Get screened for postpartum depression using the Edinburgh Postnatal Depression Scale
- Work with a therapist or counselor who specializes in postpartum mental health
- Address nutritional deficiencies, especially omega-3s, B vitamins, vitamin D, and iron
- Stabilize blood sugar by eating protein and fat with every meal and snack
- Consider targeted supplements like magnesium, methylated B vitamins, and omega-3s
- Seek immediate help if you have thoughts of harming yourself or your baby
Sign #4: Hair Loss Beyond Normal Postpartum Shedding
What It Looks Like
Around 3-6 months postpartum, most women experience some hair shedding as hormone levels normalize. This is expected and temporary. But if you're still losing significant amounts of hair months or years later, or if your hair is noticeably thinner, breaking easily, or not growing back, that's a sign of depletion.
You might notice:
- Handfuls of hair coming out in the shower
- Thinning at the temples or crown
- A widening part
- Hair that's dry, brittle, and breaks easily
- Eyebrow thinning
- Overall loss of hair volume and thickness
Why It Happens
Hair growth requires significant nutritional resources. Each hair follicle needs:
- Protein: Hair is made of keratin, a protein
- Iron: Essential for hair follicle function
- Zinc: Critical for hair growth and repair
- B vitamins: Especially biotin, B12, and folate
- Vitamin D: Plays a role in hair follicle cycling
- Essential fatty acids: For scalp health and hair strength
When these nutrients are depleted, your body prioritizes vital organs over hair growth. Hair follicles go into a resting phase, and existing hair sheds without adequate regrowth.
Additionally, thyroid dysfunction (common postpartum) can cause significant hair loss.
What Makes It Different from Normal Postpartum Shedding
Normal postpartum hair loss:
- Occurs around 3-6 months postpartum
- Lasts for 3-6 months
- Gradually improves without intervention
- Hair regrows normally
Depletion-related hair loss:
- Continues beyond 6-9 months postpartum
- May worsen over time
- Doesn't improve without addressing underlying deficiencies
- Hair may not regrow fully or may grow back thin and weak
What to Do
- Check iron levels (ferritin should be above 70 ng/mL for optimal hair growth)
- Check thyroid function (TSH, Free T3, Free T4, thyroid antibodies)
- Ensure adequate protein intake (at least 80-100g per day)
- Supplement with iron (if deficient), zinc, biotin, and a B-complex
- Consider collagen peptides to support hair structure
- Be patient—hair regrowth takes 3-6 months after addressing deficiencies
Sign #5: Difficulty Losing Weight or Unexplained Weight Gain
What It Looks Like
You're eating healthy and exercising, but the weight won't budge. Or worse, you're gaining weight despite your best efforts. Your pre-pregnancy clothes still don't fit, and you feel stuck. You might have stubborn belly fat that won't respond to diet or exercise.
You feel frustrated and defeated. You wonder if your body will ever be the same.
Why It Happens
Weight struggles in postnatal depletion are rarely about calories in versus calories out. Multiple factors are at play:
- Thyroid dysfunction: Hypothyroidism slows metabolism and causes weight gain
- Insulin resistance: Hormonal changes and poor diet can impair blood sugar regulation
- Cortisol dysregulation: Chronic stress elevates cortisol, promoting belly fat storage
- Estrogen dominance: Imbalanced estrogen and progesterone can cause weight gain
- Metabolic adaptation: If you've been restricting calories, your metabolism has slowed to conserve energy
- Inflammation: Chronic inflammation impairs metabolism and promotes fat storage
When your body is depleted and stressed, it holds onto weight as a protective mechanism. It thinks you're in a famine and doesn't feel safe releasing stored fat.
What Makes It Different from Normal Postpartum Weight Retention
Normal postpartum weight loss:
- Gradual, steady loss over 6-12 months
- Responds to reasonable diet and exercise
- No other symptoms of hormonal imbalance
Depletion-related weight struggles:
- Weight won't budge despite efforts, or continues to increase
- Accompanied by other symptoms (fatigue, hair loss, mood changes)
- Often involves stubborn belly fat
- May include other signs of hormonal imbalance (irregular periods, PMS, low libido)
What to Do
- Get comprehensive hormone testing (thyroid, cortisol, estrogen, progesterone, testosterone)
- Check fasting insulin and glucose to assess insulin sensitivity
- Stop restricting calories—eat enough to support your metabolism
- Focus on nutrient-dense whole foods, adequate protein, and healthy fats
- Manage stress through rest, boundaries, and nervous system regulation
- Consider working with a functional nutritionist who understands postpartum metabolism
Sign #6: Frequent Illness and Weakened Immune System
What It Looks Like
You catch every cold that goes around. You get sick frequently and take longer to recover. You might have recurring infections (sinus infections, UTIs, yeast infections). Your body just doesn't seem to fight off illness like it used to.
Why It Happens
Your immune system requires significant nutritional resources to function properly:
- Vitamin D: Critical for immune function; deficiency is extremely common postpartum
- Zinc: Essential for immune cell production and function
- Vitamin C: Supports immune response and tissue repair
- Vitamin A: Necessary for mucosal immunity (your first line of defense)
- Selenium: Important for immune regulation
- Protein: Required to produce antibodies and immune cells
When you're depleted, your immune system doesn't have what it needs to protect you. Additionally, chronic stress, sleep deprivation, and poor gut health (which houses 70% of your immune system) all impair immune function.
What to Do
- Vitamin D blood levels: There is no established universal postpartum target of 50–80 ng/mL. NIH considers 20 ng/mL or more sufficient for most people and notes potential adverse effects above 50 ng/mL. Discuss your result with a qualified healthcare professional. NIH vitamin D guidance.
- Ensure adequate protein intake
- Eat a variety of colorful fruits and vegetables for antioxidants
- Support gut health with fermented foods and/or probiotics
- Prioritize sleep as much as possible
- Consider immune-supportive supplements like vitamin D, zinc, vitamin C, and elderberry
Sign #7: Sleep Problems Even When You Have the Opportunity
What It Looks Like
Your baby finally sleeps through the night, but you don't. You lie awake for hours, mind racing. Or you fall asleep easily but wake up at 2am and can't get back to sleep. Or you sleep for eight hours but wake up feeling like you haven't slept at all.
Why It Happens
Sleep problems in postnatal depletion are often related to:
- Cortisol dysregulation: Your stress hormones are out of rhythm, causing nighttime wakefulness
- Blood sugar instability: Low blood sugar at night triggers cortisol release, waking you up
- Magnesium deficiency: Magnesium is essential for sleep; deficiency causes insomnia
- Thyroid dysfunction: Both hyper and hypothyroidism can disrupt sleep
- Anxiety: Nutrient deficiencies and hormonal imbalances contribute to nighttime anxiety
What to Do
- Eat a small protein and fat snack before bed to stabilize blood sugar
- Supplement with magnesium glycinate (300-400mg before bed)
- Practice good sleep hygiene (dark room, cool temperature, consistent schedule)
- Consider adaptogenic herbs to support cortisol rhythm
- Get tested for thyroid dysfunction if sleep problems persist
Sign #8: Low Libido and Lack of Interest in Intimacy
What It Looks Like
You have zero interest in sex. The thought of intimacy feels like another chore on your to-do list. You love your partner, but you just don't feel desire. This might be causing tension in your relationship.
Why It Happens
Low libido postpartum is incredibly common and multifactorial:
- Hormonal changes: Estrogen and testosterone levels are often low postpartum, especially while breastfeeding
- Exhaustion: When you're depleted, your body has no energy for non-essential functions like sex drive
- Nutrient deficiencies: Zinc, vitamin D, and B vitamins all play roles in hormone production and libido
- Stress: High cortisol suppresses sex hormones
- Emotional factors: Feeling disconnected from your body, relationship stress, and lack of support all impact desire
What to Do
- Communicate openly with your partner about what you're experiencing
- Address physical depletion through nutrition and rest
- Check hormone levels if low libido persists beyond 6-12 months
- Consider pelvic floor physical therapy if pain or discomfort is a factor
- Prioritize connection with your partner in non-sexual ways
- Be patient with yourself—recovery takes time
Sign #9: Anxiety, Overwhelm, and Difficulty Coping with Stress
What It Looks Like
You feel anxious about everything. Small stressors feel overwhelming. You worry constantly about your baby, your health, your relationship. You might have physical symptoms like racing heart, shortness of breath, or digestive issues. You feel like you're barely holding it together.
Why It Happens
Anxiety in postnatal depletion is often driven by:
- Magnesium deficiency: Magnesium is nature's "calm mineral"; deficiency causes anxiety
- B vitamin deficiencies: B vitamins are essential for nervous system function
- Blood sugar instability: Blood sugar crashes trigger anxiety and panic
- Thyroid dysfunction: Hyperthyroidism causes anxiety; hypothyroidism can cause anxiety and depression
- Adrenal dysfunction: Depleted stress hormones impair your ability to cope with stress
What to Do
- Stabilize blood sugar by eating every 3-4 hours with protein and fat
- Supplement with magnesium glycinate (400-600mg daily)
- Consider a B-complex with methylated B vitamins
- Practice nervous system regulation (deep breathing, gentle movement, time in nature)
- Seek professional support if anxiety is severe or interfering with daily life
Sign #10: Digestive Issues (Bloating, Constipation, or Irregular Bowel Movements)
What It Looks Like
You're bloated all the time. You're constipated or have irregular bowel movements. You might have stomach pain, gas, or discomfort after eating. Your digestion just doesn't feel right.
Why It Happens
Digestive issues in postnatal depletion are caused by:
- Dehydration: Extremely common postpartum, especially if breastfeeding
- Inadequate fiber: Not eating enough vegetables and whole foods
- Magnesium deficiency: Magnesium is essential for bowel motility
- Thyroid dysfunction: Hypothyroidism commonly causes constipation
- Stress: High cortisol impairs digestion
- Gut microbiome disruption: Pregnancy, antibiotics during labor, and poor diet all affect gut health
What to Do
- Drink at least 80-100 ounces of water daily
- Eat plenty of fiber-rich foods (vegetables, fruits, whole grains, legumes)
- Supplement with magnesium citrate or glycinate
- Consider a high-quality probiotic
- Eat fermented foods (yogurt, kefir, sauerkraut, kimchi)
- Check thyroid function if constipation is severe
How Many Signs Do You Have? Assessing Your Depletion Level
Count how many of the 10 signs you're currently experiencing:
0-2 signs: You may have mild depletion or normal postpartum adjustment. Focus on prevention through good nutrition, adequate rest, and self-care.
3-5 signs: You likely have moderate postnatal depletion. It's time to take action with targeted nutrition, supplementation, and lifestyle changes.
6-8 signs: You have significant depletion that requires comprehensive intervention. Work with a qualified practitioner to create a recovery plan.
9-10 signs: You have severe depletion. Please seek professional support immediately. You need comprehensive testing, targeted treatment, and possibly medical intervention.
What to Do Next: Your Recovery Roadmap
If you've recognized yourself in three or more of these signs, here's your action plan:
Step 1: Get Proper Testing
Work with a practitioner who understands postnatal depletion to order comprehensive testing:
- Complete blood count (CBC)
- Iron panel (ferritin, serum iron, TIBC, transferrin saturation)
- Thyroid panel (TSH, Free T3, Free T4, TPO antibodies, TG antibodies)
- Vitamin D
- Vitamin B12 and folate
- Magnesium (RBC magnesium, not serum)
- Comprehensive metabolic panel
- Hormone panel if indicated (cortisol, estrogen, progesterone, testosterone)
Step 2: Address Nutrition
- Eat enough calories (at least 2,000-2,500 per day)
- Include protein at every meal (20-30g minimum)
- Eat every 3-4 hours to stabilize blood sugar
- Drink 80-100 ounces of water daily
- Focus on nutrient-dense whole foods
- Limit processed foods, sugar, and caffeine
Step 3: Strategic Supplementation
Based on your test results, you may need:
- High-quality prenatal or multivitamin
- Iron (if deficient)
- Vitamin D supplements: A qualified healthcare professional should decide whether testing or supplementation is needed and select a dose for your circumstances. The adult upper intake limit, including during breastfeeding, is 4,000 IU daily from food, drinks, and supplements; higher treatment doses require medical supervision. NIH vitamin D guidance.
- Omega-3s (at least 1,000mg DHA daily)
- Magnesium glycinate (300-600mg daily)
- B-complex with methylated B vitamins
- Probiotics for gut health
Step 4: Prioritize Rest and Recovery
- Sleep when you can (even if it's not at night)
- Ask for and accept help
- Set boundaries and say no to non-essential commitments
- Practice stress management (even 5 minutes of deep breathing helps)
- Move your body gently (walking, yoga, stretching)
Step 5: Get Professional Support
Consider working with:
- A functional nutritionist who specializes in postnatal depletion
- A naturopathic doctor or functional medicine practitioner
- A therapist or counselor for emotional support
- A postpartum doula for practical help
Frequently Asked Questions
Q: Can postnatal depletion happen with every pregnancy?
A: Yes. In fact, depletion often worsens with each pregnancy if you haven't fully recovered from the previous one. This is why many women feel significantly worse after their second or third baby.
Q: How long does it take to recover from postnatal depletion?
A: With proper intervention, most women see significant improvement within 3-6 months. Full recovery typically takes 6-12 months, depending on the severity of depletion and how long it's been present.
Q: Can I recover from postnatal depletion while breastfeeding?
A: Yes! You can absolutely recover while breastfeeding. The key is eating enough, supplementing appropriately, and prioritizing rest. Some women choose to wean to accelerate recovery, but it's not necessary.
Q: Is postnatal depletion the same as postpartum depression?
A: No, they're different conditions, though they often overlap. Postnatal depletion is primarily physical and nutritional, while postpartum depression is a mental health condition. However, nutritional depletion can contribute to mood disorders, and addressing depletion often improves mental health.
Q: Can men experience postnatal depletion?
A: While men don't experience the physical demands of pregnancy and breastfeeding, new fathers can experience depletion from sleep deprivation, stress, and lifestyle changes. The term "postnatal depletion" specifically refers to the maternal experience, but fathers also need support during the postpartum period.
Q: Will I ever feel like myself again?
A: Yes! With proper treatment, most women make full recoveries and feel even better than before. Many of my clients say they feel better at 2-3 years postpartum (after treatment) than they did before pregnancy.
You Don't Have to Suffer: Getting Help
If you're experiencing three or more signs of postnatal depletion, please know: this is not normal, and you don't have to suffer through it.
You deserve to feel energized, clear-headed, and like yourself again. You deserve to enjoy motherhood, not just survive it. And with the right support, you absolutely can recover.
Ready to Take Action?
Option 1: Take the Free Postnatal Depletion Quiz
Not sure how depleted you are? Take our free 5-minute quiz to assess your symptoms and get personalized recommendations.
Option 2: Book a Free Discovery Call
If you're ready for personalized support, book a free 20-minute discovery call with me. We'll discuss your specific symptoms, review your history, and I'll share exactly how I can help you recover your energy and vitality.
Option 3: Read More About Recovery
Check out our other articles on postpartum nutrition, recovery protocols, and success stories from mothers who've recovered from severe depletion.
Clinical Evidence & Maternal Nutrition References
- NIH Office of Dietary Supplements (ODS): Fact sheets for health professionals on Iron, Vitamin B12, Vitamin D, Iodine, Choline, Magnesium, and Omega-3 Fatty Acids during pregnancy and lactation.
- Centers for Disease Control and Prevention (CDC): Maternal Diet and Micronutrient Considerations for Breastfeeding Mothers (iron, B12, iodine, and vitamin D guidance).
- American College of Obstetricians and Gynecologists (ACOG): Committee Opinion No. 736 — Optimizing Postpartum Care (ongoing fourth-trimester and longitudinal maternal follow-up).