Lactation and Breastfeeding

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Lactation Physiology - Milk Miracles

  • Hormonal Control:
    • Prolactin (Ant. Pituitary): Milk synthesis (Lactogenesis II). ↑ with suckling.
    • Oxytocin (Post. Pituitary): Milk ejection (let-down reflex); myoepithelial cell contraction. Stimulated by suckling.
  • Stages of Lactation:
    • Mammogenesis: Breast development (estrogen, progesterone, prolactin).
    • Lactogenesis I: Mid-pregnancy; colostrum production; high progesterone inhibits full lactation.
    • Lactogenesis II: Postpartum (day 2-3); ↓ progesterone → copious milk ("milk coming in").
    • Galactokinesis: Maintenance via suckling & milk removal.
    • Involution: Weaning → ↓ prolactin → milk cessation.
  • Key Reflexes:
    • Suckling Reflex: Stimulates prolactin & oxytocin.
    • Let-down Reflex: Oxytocin-mediated milk ejection.

Hormonal Control of Lactation

⭐ Prolactin is essential for milk synthesis, whereas oxytocin triggers milk ejection.

Breast Milk Composition - Nutrient Nectar

  • Energy: ~65-70 kcal/100ml.
  • Types & Key Changes:
    • Colostrum (first 3-4 days): ↑Protein, ↑IgA, ↑Vitamin A, ↓Fat, ↓Lactose. "Liquid Gold".
    • Mature Milk: ↑Fat, ↑Lactose.
  • Macronutrients (Mature Milk):
    • Carbohydrates: Lactose (main sugar, aids Ca absorption).
    • Proteins (0.9-1.1 g/dL): Whey:Casein ratio changes from 90:10 (colostrum) to 60:40 (mature). Key: α-lactalbumin, lactoferrin.
    • Fats (3.5-4.0 g/dL): Triglycerides; essential fatty acids (DHA, ARA) for neurodevelopment.
  • Key Immunological Factors:
    • Secretory IgA (sIgA), Lactoferrin, Lysozyme, Macrophages, Lymphocytes.
    • Human Milk Oligosaccharides (HMOs) - prebiotics.
  • Vitamins & Minerals:
    • Low: Vitamin D, Vitamin K (prophylaxis needed for Vit K at birth; Vit D supplementation for baby).
    • Iron: Low quantity, but high bioavailability (~50% vs. ~10% from formula). Colostrum vs Mature Milk Nutrient Composition

⭐ Whey protein in human milk is more easily digestible than casein, contributing to softer stools and less GIT upset in breastfed infants compared to formula-fed infants. Human milk's whey:casein ratio is initially high (e.g., 80:20 or 70:30) and transitions to about 60:40 in mature milk, whereas cow's milk is about 20:80 (casein-dominant).

Breastfeeding Techniques - Latch & Love

  • Good Latch (C.H.I.N.S. Mnemonic 📌):
    • Chin touches breast.
    • Head free, slight extension.
    • Inverted lower lip (flanged).
    • Nose clear.
    • Support breast (C/U-hold).
    • Mouth wide; large areola in mouth (more seen above than below).
    • Painless; rhythmic suck/swallow. Proper Breastfeeding Latch Diagram
  • Positioning:
    • Mother comfortable; baby aligned (ear-shoulder-hip straight line).
    • Common Holds: Cradle, Cross-cradle, Football (clutch), Side-lying.
  • Feeding Cues & Frequency:
    • Early cues: Rooting, sucking motions, hand-to-mouth. (Crying: late sign).
    • Feed on demand: Typically 8-12 times in 24 hours.
  • "Love" - Bonding & Benefits:
    • Skin-to-skin contact: Promotes bonding, regulates baby's vitals.
    • Oxytocin release: ↑Maternal-infant bond, aids milk ejection (let-down).

⭐ Asymmetrical latch is crucial: baby's nose to nipple, ensuring more areola is taken with the lower lip for effective milk transfer and nipple comfort.

Breastfeeding Challenges - Problem Solvers

  • Sore/Cracked Nipples:
    • Cause: Poor latch.
    • Tx: Latch correction, lanolin, air dry. EBM application.
  • Engorgement: (Day 2-5 postpartum)
    • Cause: Milk stasis.
    • Tx: Frequent feeds/pump, warm compress (before), cold (after). Reverse pressure softening.
  • Plugged Ducts:
    • Tx: Warm compress, massage, frequent feeds, vary positions.
  • Mastitis: (Unilateral, tender, red, warm breast; fever)
    • Tx: Continue BF/pump. Analgesics. Antibiotics (Dicloxacillin 500mg QID x 10-14d).

    ⭐ Most common cause of infective mastitis is Staphylococcus aureus.

  • Nipple Candidiasis: (Burning pain, itchy, shiny nipple)
    • Tx: Antifungals (mother & baby, e.g., miconazole, nystatin).
  • Insufficient Milk Supply (IMS):
    • Tx: Effective latch, frequent emptying. Galactagogues (guided). Hydration, nutrition.

Reverse pressure softening for breast engorgement

High‑Yield Points - ⚡ Biggest Takeaways

  • Prolactin (anterior pituitary) for milk production; Oxytocin (posterior pituitary) for milk ejection.
  • Colostrum (first 3-4 days): rich in IgA, protein, and growth factors.
  • Exclusive breastfeeding: recommended for first 6 months; continue up to 2 years.
  • Key contraindications: Infant galactosemia, maternal HIV, active TB.
  • Mastitis: commonly S. aureus; treat with antibiotics, continue breastfeeding.
  • Vitamin K at birth for all; Vitamin D supplementation for breastfed infants.

Practice Questions: Lactation and Breastfeeding

Test your understanding with these related questions

Basanti, a 29-year-old female from Bihar, presents with drug-sensitive tuberculosis. She delivers a baby. All of the following are indicated except:

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Flashcards: Lactation and Breastfeeding

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_____ is considered superior to all other parenteral iron supplementation especially for postpartum IDA.

TAP TO REVEAL ANSWER

_____ is considered superior to all other parenteral iron supplementation especially for postpartum IDA.

Ferric carboxymaltose

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