Starting Full Milk Feeds Right Away: What a Major New Trial Means for Moderately Premature Babies

How the FEED1 trial tested early full milk feeding against the traditional gradual approach in babies born at 30 to 33 weeks

For babies born between 30 and 33 weeks of pregnancy, doctors have long faced a choice: start milk feeds slowly while a drip provides nutrition, or begin full milk feeds right away. A major UK trial called FEED1 tested both approaches in over 2,000 babies and found that starting full milk feeds from day one is safe — it did not increase the risk of a serious bowel problem — though it did not get babies home from hospital any sooner.

Why This Question Matters for Families of Moderately Premature Babies

If your baby was born a little early — somewhere in the range of 30 to 33 weeks, rather than right at term — one of the first practical decisions your neonatal team faces is how to feed your baby. Babies born this early are usually strong enough to breathe reasonably well and to feed, but their digestive system is still catching up, and doctors have long worried that pushing milk feeds too fast, too soon, could trigger a serious problem. Deciding how quickly to build up feeds might sound like a small, technical detail, but it affects how many tubes and lines your baby has, how quickly you might get to hold and feed your baby yourself, and how your baby's first days in hospital actually look and feel.

How Families and Doctors Used to Face This Problem

FEED1 — a trial run in 46 newborn special care and intensive care units across England, Scotland, and Wales — set out to answer a question that had gone unanswered for babies in this particular group: those born between 30 and 33 weeks, who are more mature than the tiniest, most fragile premature babies but still not ready to feed the way a full-term baby does [1]. For decades, the standard approach in most neonatal units was caution: start a baby on intravenous fluids (a drip) for nutrition, and only slowly, carefully increase milk feeds over several days, watching closely for any sign of trouble. That caution grew out of real and serious concern about necrotising enterocolitis, sometimes called NEC — a disease in which part of a premature baby's bowel becomes inflamed and, in severe cases, badly damaged. Because NEC can be so serious, and because doctors could not always predict which babies were vulnerable, gradual feeding became the safer-seeming default almost everywhere. Over time, though, large studies began to question whether such caution was still necessary for every baby. A big UK study called the Speed of Increasing Feeds Trial, or SIFT, tested faster versus slower feeding increases in very premature and very small babies and did not find that faster feeding caused more harm [2]. Even earlier, a UK study called the Abnormal Doppler Enteral Prescription Trial, or ADEPT, looked at babies whose growth had been slowed in the womb — a group doctors worried about especially — and tested starting feeds earlier versus later, again without finding it caused more problems [3]. When researchers pooled together this kind of evidence from multiple studies in a major 2020 review, they found no clear sign that feeding babies earlier or faster raised the risk of NEC, though the evidence at that point still left some uncertainty [4]. Put together, this growing body of research had already started to soften decades of feeding caution — but no one had specifically tested immediate full feeding, head-to-head against gradual feeding, in babies born at exactly 30 to 33 weeks, using a study big enough to give a confident answer. That is precisely the gap FEED1, designed and registered in advance as a formal research plan, was built to fill [5].

How the Study Was Done

Between October 2019 and July 2024, the FEED1 team invited families at 46 NHS hospitals to take part [1]. Of more than 8,000 babies who might have qualified, just over 2,000 were ultimately enrolled — 1,047 randomly assigned (like a coin flip, by computer, to make sure the comparison was fair) to start full milk feeds right away, and 1,041 assigned to the more traditional gradual approach. To take part, a baby had to be born between 30 and 33 weeks, be enrolled within the first three hours of life, and be considered stable enough that the baby's own doctor genuinely was not sure which feeding approach was better — in other words, families were only asked to join when real medical uncertainty existed. Babies with certain birth defects that would make milk feeding unsafe, or who had both slowed growth before birth and a specific worrying blood-flow finding on ultrasound, were not included. In the early-feeding group, babies received milk — by mouth or through a small feeding tube — starting within three hours of birth, building quickly to a full feeding volume, and avoiding a drip unless it became medically necessary. In the gradual-feeding group, babies received a drip for fluids and nutrition alongside small, slowly increasing milk feeds, following whatever approach was already standard at that particular hospital.

What the Trial Found

The trial's main question was whether starting full milk feeds sooner would get babies home from the hospital faster. It did not: babies in the early-feeding group stayed in hospital for an average of 32.4 days, compared with 32.1 days in the gradual-feeding group — a difference so small it counts as no real difference at all. What mattered most to families and doctors, though, was safety, and here the news was reassuring. Necrotising enterocolitis (the serious bowel problem doctors worry most about) occurred in only 4 out of 1,030 babies fed fully from day one, compared with 6 out of 1,027 babies fed gradually — in other words, slightly fewer cases in the early-feeding group, not more. Low blood sugar, another early concern with fast feeding, was also no more common in the early-feeding babies. And survival was essentially identical between the two groups, at about 99.6% in each.

Where early feeding did make a real, measurable difference was in how much medical equipment and support a baby needed in the first days of life. Babies fed fully from day one reached full milk feeds about a day sooner on average (7.0 days versus 7.9 days) and spent far less time needing a drip for nutrition (about 1 day versus nearly 3 days). They also needed fewer central lines — the thin, longer-lasting tubes sometimes placed into a deeper vein — and, when a line was needed at all, needed it in place for a shorter time. For many families, this translates into a baby with fewer tubes and wires attached in those first critical days. Breastfeeding rates at the time of discharge were about the same in both groups (roughly 44% versus 43% for any breastfeeding), so choosing early full feeding did not appear to help or hurt a family's breastfeeding journey either way.

What This Means for Your Baby's Care

What should a family take from all of this? If your baby is born between 30 and 33 weeks and your neonatal team offers early full milk feeding, the evidence from FEED1 suggests this is a genuinely safe option — not an experimental gamble — even though it will not shorten how long your baby needs to stay in hospital. Independent experts who reviewed the trial after publication agreed with this reading: one commentary published alongside the trial in the same medical journal described the safety results as reassuring and the trial itself as large and well-conducted enough to be trusted in everyday hospital care, not just in ideal research conditions [6]. A separate independent review of the evidence reached the same conclusion, noting that babies can reasonably be offered full milk feeds from day one without doctors expecting more bowel problems, while being honest with families that it will not necessarily mean an earlier discharge [7]. And when researchers combined FEED1's results with those of similar smaller studies from around the world, they found the same reassuring pattern — no rise in bowel problems from earlier feeding across the wider body of evidence [8]. It is worth remembering, though, that FEED1 only enrolled babies whose own doctors were genuinely unsure which approach was best; for babies with more complicated medical needs, or born outside the 30–33 week window this trial studied, the same reassurance may not automatically apply, and your baby's care team is best placed to weigh that for your specific situation.

What Researchers Are Working On Next

Researchers are not finished with this question. The FEED1 team is continuing to follow the babies in this trial until they are two years old (adjusted for how early they were born) to check on their longer-term development — results that are not yet available but will matter a great deal, since safety in the first weeks of life does not automatically guarantee everything will be equally fine years later. Other researchers reviewing feeding evidence more broadly have pointed out that the best feeding speed probably differs depending on exactly how premature a baby is and how stable they are, which is why FEED1's reassurance is specific to the 30-to-33-week group it studied rather than a rule for every premature baby [9]. A recent overview of feeding research across prematurity more broadly agrees, describing FEED1 as an important piece of the puzzle rather than the final word, and calling for similar large trials in babies born even earlier [10]. Other researchers are working on standardising feeding approaches for slightly larger premature babies too, aiming for feeding guidelines based on solid evidence rather than habit or hospital-to-hospital variation [11]. Finally, a separate study looking specifically at the cost of care for babies in the FEED1 trial found no significant difference in overall hospital costs between the two feeding approaches, with a hint that costs might be somewhat lower for two smaller groups of babies within the trial; because our team has not yet been able to independently verify the full details of that cost study, we are mentioning its headline finding here only in outline, and will cover it properly in its own right once we can review it directly [12].

References

  1. Ojha S, Mitchell EJ, Johnson MJ, et al, for the FEED1 collaborative. Full exclusively enteral fluids from day 1 versus gradual feeding in preterm infants (FEED1): an open-label, parallel-group, multicentre, randomised, superiority trial. Lancet Child Adolesc Health. 2025;9(12):827–836. doi:10.1016/S2352-4642(25)00271-800271-8) ↩
  2. Dorling J, Abbott J, Berrington J, et al; SIFT Investigators Group. Controlled Trial of Two Incremental Milk-Feeding Rates in Preterm Infants. N Engl J Med. 2019;381(15):1434–1443. doi:10.1056/NEJMoa1816654 ↩
  3. Leaf A, Dorling J, Kempley S, et al; Abnormal Doppler Enteral Prescription Trial Collaborative Group. Early or Delayed Enteral Feeding for Preterm Growth-Restricted Infants: A Randomized Trial. Pediatrics. 2012;129(5):e1260–e1268. doi:10.1542/peds.2011-2379 ↩
  4. Walsh V, Brown JVE, Copperthwaite BR, Oddie SJ, McGuire W. Early full enteral feeding for preterm or low birth weight infants. Cochrane Database Syst Rev. 2020;2020(12):CD013542. doi:10.1002/14651858.CD013542.pub2 ↩
  5. Mitchell EJ, Meakin G, Anderson J, et al. The FEED1 trial: protocol for a randomised controlled trial of full milk feeds versus intravenous fluids with gradual feeding for preterm infants (30–33 weeks gestational age). Trials. 2022;23:64. doi:10.1186/s13063-021-05994-z ↩
  6. Francis KL, Manley BJ. Clinical and statistical insights from the FEED1 trial. Lancet Child Adolesc Health. 2025;9(12):818–819. doi:10.1016/S2352-4642(25)00304-900304-9) ↩
  7. Baker J, Gowda H. EBNEO Commentary: Early Full Enteral Feeding Compared With Gradual Feeding Increase in Preterm Infants. Acta Paediatr. 2026;115(5):1139–1140. doi:10.1111/apa.70470 ↩
  8. Chen L, Gao Y, Liu R, et al. Early full or near-full enteral feeding in clinically stable preterm infants across healthcare settings: a systematic review and meta-analysis of randomized controlled trials. Front Med (Lausanne). 2026;13:1921726. doi:10.3389/fmed.2026.1921726 ↩
  9. Salas AA, Ojha S. Exclusive enteral nutrition in preterm infants: How early is too early? Semin Fetal Neonatal Med. 2025;30(2):101631. doi:10.1016/j.siny.2025.101631 ↩
  10. Romero-Lopez M, Salas AA. Enteral nutrition in neonates: current evidence from clinical trials and evolving strategies. Semin Perinatol. 2026;Epub ahead of print. doi:10.1016/j.semperi.2026.152236 ↩
  11. Fu TT, Arhin M, Schulz AT, et al. Standardizing feeding strategies for preterm infants born greater than 1500 grams. Pediatr Res. 2024;97(2):671–677. doi:10.1038/s41390-024-03483-y ↩
  12. Naghdi S, Ojha S, Dorling J, et al. Cost-consequence analysis of early full milk feeding versus gradual feeding with intravenous support in preterm infants: results from the FEED1 trial. Arch Dis Child Fetal Neonatal Ed. 2026;111(3):F262–F269. doi:10.1136/archdischild-2025-329964 ↩