Breastfeeding a premature baby: expressing, NICU and what to expect

Breastfeeding · Updated July 2026 · All articles

When a baby arrives early, the immediate focus is on their medical care. Breastfeeding may feel far away, or even impossible. But the steps you take in the very first hours after a premature birth, even before your baby can feed directly at the breast, are some of the most valuable things you can do for them. This guide covers what to expect at each stage, from those first expressions of colostrum to eventually nursing your baby in your arms.

Why breast milk matters more for premature babies

Premature babies (born before 37 weeks) are at higher risk of infections, necrotising enterocolitis (a serious bowel condition), and other complications. Breast milk, and especially the colostrum produced in the first days, provides a layer of protection that formula cannot replicate. Milk produced by a parent who has given birth prematurely is different from term milk: it contains higher levels of protein, fat, antibodies, and growth factors, specifically calibrated for a baby who needs to catch up rapidly.

Research consistently shows that premature babies who receive their own parent's breast milk have lower rates of sepsis, necrotising enterocolitis, and retinopathy of prematurity. Even small amounts of colostrum given directly into the mouth (called oral immunotherapy) appear to have benefits beyond nutrition, priming the immune system in ways that matter at this stage of life.

Expressing in the first hours

If your baby is in NICU and cannot feed from the breast yet, start expressing as soon as you are physically able to, ideally within the first one to six hours after birth. Even a few drops of colostrum collected in a syringe are significant. Ask the NICU midwife or nurse to help you with hand expressing: in the first 24 hours, hand expression is often more effective than a pump for colostrum, which is produced in small amounts and has a thick, sticky texture.

From around 24 hours after birth, moving to a hospital-grade double electric pump will help you establish a supply more effectively than a standard single pump. Most NICUs have pumps available, and many can arrange hire of a hospital-grade pump for home use when you are discharged. Aim to express eight to ten times in every 24 hours, including at least once overnight. The overnight session matters because prolactin levels are highest between midnight and 6 am, and those sessions have a strong effect on supply.

Keep a log of how much you express at each session. Output is often very small at first, which is normal and does not mean you will not be able to supply your baby. Supply builds gradually with consistent stimulation over days and weeks.

NICU feeding methods

Premature babies who cannot yet coordinate the suck-swallow-breathe reflex needed for breastfeeding will receive your expressed milk by tube: either a nasogastric tube (passed through the nose) or an orogastric tube (passed through the mouth). Tube feeding is safe and effective, and it means your baby is still getting your milk even when direct nursing is not yet possible.

As your baby matures and begins to show feeding readiness cues, the NICU team may introduce cup feeding or finger feeding as stepping stones toward the breast. Cup feeding, where small amounts of milk are offered in a small medicine cup tilted to the lip, preserves breastfeeding by avoiding teat use and is used in many NICUs in the UK as a bridge method.

If bottles are used, ask for slow-flow teats and use paced bottle feeding, where the bottle is held more horizontally so the baby has to work for the milk rather than it flowing freely. This helps maintain the expectation of working at the breast.

Kangaroo care and its role in breastfeeding

Kangaroo care means holding your baby skin-to-skin on your chest, ideally for long, uninterrupted periods each day. The evidence behind it is strong: it stabilises your baby's heart rate, oxygen levels, and body temperature; it reduces pain and stress; and it has a meaningful positive effect on breastfeeding.

From a feeding perspective, kangaroo care works on several levels. It boosts prolactin and oxytocin, increasing milk production. It helps your baby find their way to the breast instinctively through smell and touch. Babies who have frequent and extended kangaroo care tend to show breastfeeding readiness cues earlier and transition from tube to breast feeding sooner than those with less skin-to-skin contact. Ask your NICU team how to incorporate kangaroo care into your daily routine, even when your baby has lines and monitoring in place.

Transitioning from tube to breast

Most premature babies begin learning to feed at the breast around 30 to 34 weeks corrected gestational age, though this varies widely depending on the individual baby's health and maturity. The process is gradual and should not be rushed. The goal at first is not to have your baby get all their nutrition from the breast immediately; it is to let them practice the sensations of nursing, find their latch, and begin to coordinate sucking and swallowing.

Non-nutritive sucking at the breast (when the breast has been expressed so it is soft, and the baby sucks for comfort rather than a large milk transfer) is often encouraged early as practice. Your NICU team will guide you on when to start trial feeds at the breast, how to tell whether the baby is actually transferring milk, and how to weigh before and after feeds to track intake.

The transition can take days or weeks. Some babies go from tube to fully breastfeeding relatively quickly; others need a longer period of combination feeding. Be prepared for setbacks: illness, procedures, or a growth spurt can temporarily reduce a baby's willingness or ability to nurse. This is normal and does not mean the transition has failed.

Corrected age and realistic timelines

Premature babies are assessed using their corrected age (counted from their original due date, not their birth date) for the first one to two years. This matters enormously for breastfeeding. A baby born ten weeks early will not be developmentally ready to nurse as efficiently as a term newborn until around ten weeks after their due date. Expecting a premature baby to reach breastfeeding milestones at the same rate as a term baby sets an unrealistic standard and can lead to unnecessary worry.

Correct your expectations as well as your calculations. Many premature babies go on to breastfeed fully and successfully, but the timeline is different from a term journey, and that difference is entirely normal.

Donor milk when supply is low

If your supply is not meeting your baby's needs, pasteurised donor breast milk from a certified milk bank is the recommended alternative for premature babies in NICU, ahead of formula. Donor milk retains many of the protective properties of breast milk, including growth factors and some immunological components, though pasteurisation reduces the antibody content compared to fresh milk.

Receiving donor milk does not mean you have failed or that you should stop trying to build your own supply. Many parents receive donor milk in the early weeks while their supply is still establishing, and then gradually transition to feeding their baby their own milk as output increases. Donor milk and your own milk can be used together.

Frequently asked questions

When should I start expressing after a premature birth?

As soon as possible, ideally within one to six hours of giving birth if your condition allows. Even tiny amounts of colostrum collected in the first hours are enormously valuable for a premature baby's gut and immune system. Hand expressing is usually the most effective method in the first 24 hours. Ask your NICU midwife or nurse for help, as most units provide trained support.

How often should I pump for a premature baby in NICU?

Aim to express eight to ten times in 24 hours, including at least once overnight. This mimics the frequency a term newborn would feed and sends a strong supply signal to your body. Using a hospital-grade double pump is recommended for premature babies in NICU, as it is more effective at establishing and maintaining supply than single or home pumps. Your NICU team will advise on pump access.

When can my premature baby start breastfeeding directly?

Most premature babies begin learning to feed at the breast around 30 to 34 weeks corrected gestation, though this varies. Before then, the suck-swallow-breathe coordination needed for direct breastfeeding is not yet mature. Your NICU team will let you know when your baby is showing readiness cues and will support you through the transition from tube or cup feeds to nursing at the breast.

What is kangaroo care and does it help with breastfeeding?

Kangaroo care means holding your baby skin-to-skin on your chest, ideally for extended periods each day. It has a strong evidence base for premature babies: it stabilises heart rate and temperature, reduces stress, and significantly supports breastfeeding by stimulating milk production through prolactin, signalling readiness cues earlier, and helping your baby associate the smell and warmth of your body with comfort and feeding.

What if I cannot produce enough milk for my premature baby?

If your supply is insufficient to meet your premature baby's needs, donor breast milk from a certified milk bank is often the next choice for premature babies in NICU. Pasteurised donor milk retains many of the benefits of breast milk, though not the specific antibodies tailored to your baby's environment. Your NICU team will discuss the options with you. There is no shame in needing support, and any breast milk you can provide is beneficial.

How do I use corrected age for breastfeeding milestones?

Corrected age (sometimes called adjusted age) is calculated from your baby's original due date rather than their birth date. For breastfeeding, this matters most in the first year. A baby born at 28 weeks who is 12 weeks old chronologically is closer to 2 weeks corrected age, and their feeding development will reflect that. Most premature babies reach breastfeeding milestones closer to their corrected age than their actual age.

This article is for general information only. Always consult your midwife, health visitor, GP, or a registered lactation consultant for advice about your specific situation.