5.4 Prematurity and the NICU

The Preterm and Late-Preterm Challenge

A preterm infant is born before 37 weeks; the late-preterm infant (34 0/7 to 36 6/7 weeks) looks deceptively like a term baby but is physiologically immature — the most commonly tested trap. These infants share predictable feeding challenges. The coordination of suck-swallow-breathe (SSB) does not mature until roughly 34-37 weeks, so younger infants cannot reliably pace breathing with swallowing.

They have low stamina and tire quickly, sleepiness that causes them to under-feed without appearing hungry, weaker tone, and a smaller mouth/jaw that makes a deep latch harder. The result is poor milk transfer, excess weight loss, and a real risk that maternal supply never gets established if the dyad waits for the infant to "just figure it out."

The governing principle: with a preterm infant you cannot rely on the baby to drive the milk supply, so the IBCLC builds and protects supply mechanically while the infant matures into effective feeding.

Establishing and Protecting Supply

When a preterm or sick infant cannot feed effectively at the breast, the IBCLC's top priority is to establish supply early and protect it. The supply-protection list:

1. Start expression early — ideally hand expression of colostrum within the first hours after birth, transitioning to a hospital-grade double electric pump.
2. Express frequently — about 8 or more times per 24 hours, including at least once overnight, to mimic newborn demand and drive prolactin.
3. Use hands-on pumping (massage + compression while pumping) to increase yield and fat content.
4. Feed colostrum first — even tiny volumes are valuable for the immature gut.
5. Track output and watch for the day-3-5 increase (secretory activation), intervening early if supply lags.
6. Protect supply during the transition — keep expressing until the infant fully replaces it with effective direct feeds.

Skin-to-Skin, Human Milk, and NEC

Kangaroo care (continuous skin-to-skin contact, ideally chest-to-chest) is a cornerstone of preterm care. It improves the infant's physiologic stability (temperature, heart rate, breathing), supports the mother's milk supply through hormonal stimulation, and eases the eventual transition to breastfeeding by giving the infant low-pressure access to the breast. The IBCLC actively promotes prolonged daily kangaroo care in the NICU.

Human milk and necrotizing enterocolitis (NEC): NEC is a serious inflammatory bowel emergency of preterm infants. Feeding human milk rather than formula reduces NEC risk substantially — evidence shows donor human milk roughly halves NEC risk compared with preterm formula, and mother's own milk is even more protective. Human milk oligosaccharides (HMOs) and other bioactive factors, absent from formula, drive this protection.

The practical hierarchy is: mother's own milk first, pasteurized donor human milk next, formula last for the preterm gut. This is the clinical "why" behind protecting maternal supply so aggressively — every milliliter of human milk lowers NEC risk.

Transitioning to the Breast and Discharge Planning

Oral feeding advances along a continuum guided by the infant's readiness cues, not a fixed calendar date:

1. Gavage (tube) feeding — expressed milk delivered by nasogastric/orogastric tube while SSB is immature.
2. Non-nutritive sucking at the emptied breast or on a finger to practice during gavage feeds.
3. Cup, spoon, or finger feeding — short-term alternatives that avoid heavy bottle reliance.
4. At-breast supplementer — a tube at the breast that lets the infant practice latch while receiving milk.
5. Direct breastfeeding — advanced as the infant shows readiness (alertness, rooting, sustained SSB, stable vitals).

Watch readiness cues (stirring, rooting, hand-to-mouth, stable color and breathing) rather than insisting on volumes. Discharge planning is where many supply gains are lost, so the IBCLC builds a concrete written plan: how often to feed/express, when and how to supplement, how to perform weigh-feed-weigh or output tracking at home, warning signs that need urgent care (lethargy, poor feeding, anuria, fewer wet diapers), and a scheduled early follow-up (often within 1-2 days) given the late-preterm infant's risk of dehydration, jaundice, and faltering growth after going home.

Worked Example: A 35-week late-preterm infant is sleepy, latches briefly then falls asleep, and has lost 9% of birth weight by day 3; the mother fears "my milk isn't coming in." The IBCLC builds a supply-protection plan: begin skin-to-skin and wake-to-feed every 2-3 hours, attempt the breast with compressions, and — because transfer is poor — start double pumping/hand expression 8+ times per 24 hours to drive secretory activation, feeding the expressed colostrum/milk by cup or finger to avoid early bottle dependence. The IBCLC sets a weigh-feed-weigh check and arranges follow-up within 1-2 days. As the infant matures and stamina improves, feeds at the breast lengthen, transfer rises, and expression is tapered only once direct feeding fully replaces it.