Breastfeeding

Physiology of Lactation - Milk Making Magic

• Key Hormones:
  • Prolactin (Anterior Pituitary): Stimulates milk synthesis in alveolar cells.
  • Oxytocin (Posterior Pituitary): Responsible for milk ejection (let-down reflex). Neurohormonal reflex: Suckling → Hypothalamus → Oxytocin release → myoepithelial cell contraction.
  • 📌 POPE: Prolactin - Oxytocin - Production - Ejection.
• Stages of Lactogenesis:
  • Lactogenesis I (Mid-pregnancy to ~day 2 postpartum): Colostrum production. Prolactin levels rise, but high progesterone inhibits copious milk secretion.
  • Lactogenesis II (Postpartum days 2-3 to ~day 8): "Milk coming in." Rapid drop in progesterone; copious milk secretion begins.
  • Galactopoiesis (Lactogenesis III; from ~day 9): Maintenance of established lactation. Controlled by suckling (prolactin, oxytocin) and milk removal (↓FIL).
• Feedback Inhibitor of Lactation (FIL): A small whey protein in milk. If milk is not removed, FIL accumulates in alveoli and inhibits further milk synthesis (autocrine control).

⭐ Suckling is the primary stimulus for both prolactin (milk synthesis) and oxytocin (milk ejection) release.

Composition of Breast Milk - Nature's Perfect Pint

• Phases of Milk:

  • Colostrum (Days 1-4): "Liquid Gold"; ↑Protein, IgA, Vit A, Na, Cl; ↓Fat, Lactose.

    ⭐ Colostrum: Rich in IgA, lactoferrin, growth factors; crucial for passive immunity & gut maturation.

  • Transitional Milk (Days 5-14): Composition shifts; ↑Lactose, Fat; ↓Protein.
  • Mature Milk (from ~Day 15):
    • Foremilk: Start of feed; watery, ↑lactose, ↓fat; quenches thirst.
    • Hindmilk: End of feed; ↑fat (~5x), calories; satiety, growth.

• Key Nutrients (Mature Milk):

  • Energy: ~67 kcal/dL.
  • CHO: Lactose; aids Ca absorption.
  • Protein: Whey dominant (60:40).
  • Fat: Main energy; DHA, ARA (brain).
  • Immunity: sIgA; Vit D, K low; Fe high bioavailability.

Benefits of Breastfeeding - Dual Perks Galore

For the Infant: 👶

• Nutritional Gold: Ideal, easily digestible nutrients.
• Immunity Boost: IgA, lactoferrin; ↓GI, respiratory, ear infections.
• Protection Plus: ↓SIDS, NEC, allergies (eczema, asthma).
• Long-term: ↓obesity, type 2 DM; better cognitive development.

For the Mother: 👩‍👧

• Speedy Recovery: ↑Oxytocin → uterine involution, ↓postpartum bleeding.
• LAM: Contraception if amenorrhea, exclusive BF, infant <6 months postpartum.
• Cancer Shield: ↓breast & ovarian cancer risk.
• Bone & Metabolic: ↓osteoporosis, type 2 DM risk.

⭐ Exclusive breastfeeding for the first 6 months is a key WHO recommendation for optimal infant health and development.

Breastfeeding Practice - Latch & Launch

📌 LATCH Score: (Latch, Audible swallowing, Type of nipple, Comfort, Hold). Score ≥7 good.

• Effective BF: Audible swallows, 6-8 wet diapers/day, 3-4 stools/day, infant satisfied.
• Problems: Sore nipples (poor latch), engorgement, mastitis, IMS.

• Contraindications:
  • Maternal: HIV (contextual), active untreated TB (>2wks Rx), certain drugs.
  • Infant: Galactosemia (absolute), PKU (partial).
• India: IYCF (EBF 6m), BFHI, MAA.

⭐ > Galactosemia in the infant is an absolute contraindication to breastfeeding.

High‑Yield Points - ⚡ Biggest Takeaways

• Exclusive breastfeeding (EBF) for the first 6 months is crucial; continue with complementary foods up to 2 years.
• Colostrum: rich in IgA, macrophages, lactoferrin; provides crucial passive immunity.
• Infant benefits: ↓ infections (diarrhea, respiratory), ↓ NEC, ↓ SIDS.
• Maternal benefits: ↓ postpartum bleeding, ↓ breast/ovarian cancer risk, LAM (child spacing).
• Key contraindications: infant galactosemia; maternal HIV (if safe alternatives exist), active untreated TB, certain drugs.
• Vitamin K administration at birth is essential as breast milk is low in it.