Premature babies born very small and very early struggle to receive enough calories and protein in their first month of life, according to a 2026 study of 168 infants. Babies with lung disease received 11.7 fewer calories per kilogram of body weight at day 28, while those with intestinal infections received 33.3 fewer calories per kilogram. Most premature babies don’t reach recommended nutrition targets until after their second week of life, affecting their growth during this critical period.
Researchers studied 168 premature babies born very early and very small to understand why they don’t get enough food and nutrients in their first month of life. According to Gram Research analysis, babies with serious lung problems or intestinal infections got even less nutrition than other premature babies. The study found that most premature babies don’t receive the recommended amount of calories and protein during their first two weeks, which affects how much they grow. This research highlights that even with careful feeding plans, premature babies in middle-income countries face real challenges getting the nutrition they need to develop properly.
Key Statistics
A 2026 prospective cohort study of 168 premature infants found that babies with bronchopulmonary dysplasia received 11.7 fewer calories per kilogram of body weight at 28 days compared to healthier premature babies.
Research shows that premature infants in the study didn’t achieve full enteral feeding until day 17 on average, with 168 babies born before 33 weeks and weighing 1500 grams or less tracked from birth.
According to a 2026 analysis of 168 premature babies, those with necrotizing enterocolitis received 33.3 fewer calories per kilogram of body weight at day 28, highlighting how serious infections interfere with nutrition delivery.
A 2026 study found that 168 premature infants achieved only 5.1 grams per kilogram per day of growth by day 28, below the recommended target, with most babies losing weight relative to healthy newborns their age.
The Quick Take
- What they studied: Why premature babies born very small and very early don’t get enough calories and protein in their first month of life, and what health problems make this worse
- Who participated: 168 premature babies born weighing 1113 grams on average (about 2.5 pounds) at 29 weeks of pregnancy, tracked from birth through 28 days old
- Key finding: Babies with lung disease got 11.7 fewer calories per kilogram of body weight, and babies with intestinal infections got 33.3 fewer calories per kilogram compared to healthier premature babies
- What it means for you: If you have a premature baby in the hospital, understanding these feeding challenges can help you ask better questions about your baby’s nutrition plan. Babies with complications need extra attention to their feeding strategy.
The Research Details
Researchers followed 168 premature babies born very early and very small from birth through their first 28 days of life. They measured exactly how many calories and grams of protein each baby received through both IV nutrition (given directly into the bloodstream) and feeding through the stomach. They also tracked how much each baby grew, what health problems developed, and how these factors connected to nutrition intake.
The babies in the study were born at less than 33 weeks of pregnancy and weighed 1500 grams or less at birth. The researchers used statistical methods to figure out which factors most strongly affected how much nutrition babies received at day 28. They looked at whether complications like lung disease or intestinal infections changed the nutrition picture.
Following babies over time rather than just taking a snapshot helps researchers understand the real-world challenges of feeding premature babies. By measuring actual nutrition delivered rather than just what doctors prescribed, the study shows the gap between what babies should get and what they actually receive. This approach reveals which babies face the biggest nutritional challenges.
This study tracked real babies in actual hospital settings, which makes the findings relevant to everyday practice. The researchers used careful statistical methods to separate which factors truly affected nutrition from factors that just happened to occur together. The study was published in a respected pediatric journal. However, the study was conducted in middle-income countries, so results may differ in other settings. The study size of 168 babies is reasonable for this type of research.
What the Results Show
Premature babies in this study received less nutrition than recommended during their first two weeks of life. On average, babies didn’t reach the target of 100 calories per kilogram of body weight until day 17. They didn’t achieve full feeding through the stomach until day 17 either. The protein-to-calorie ratio remained inadequate even by day 28, meaning babies weren’t getting the right balance of nutrients.
Babies with bronchopulmonary dysplasia, a serious lung condition affecting 32% of the group, received significantly fewer calories at day 28. Babies with necrotizing enterocolitis, a dangerous intestinal infection affecting 5% of the group, received even fewer calories. These complications appeared to interfere with the ability to deliver adequate nutrition.
Growth was slower than ideal. Babies gained an average of 5.1 grams per kilogram of body weight per day, which is below the recommended target. Most babies actually lost weight relative to healthy newborns their age, with their weight dropping about 1.5 standard deviations below normal.
The study found that the first 14 days were particularly critical. During this period, both IV nutrition and stomach feeding fell short of targets. Even babies without major complications didn’t receive optimal nutrition during this window. The combination of inadequate calories and inadequate protein created a double problem for growth. Babies with lung disease or intestinal infections faced compounded nutritional challenges on top of their medical conditions.
Previous research has shown that early nutrition matters enormously for premature baby development. This study confirms that gap between recommended nutrition and actual delivery remains a real problem, even in hospitals with structured feeding protocols. The finding that complications like lung disease reduce nutrition intake aligns with other research showing that sick babies have higher nutritional needs but often receive less. This study adds important evidence from middle-income settings, where resources may be more limited than in wealthy countries.
The study was conducted in middle-income countries, so results may not apply to hospitals in wealthier nations with more resources. The study didn’t examine all possible factors that might affect nutrition, such as specific feeding protocols used or staffing levels. The study couldn’t prove that lower nutrition directly caused slower growth, only that they occurred together. Results apply specifically to babies born before 33 weeks weighing 1500 grams or less.
The Bottom Line
If you have a premature baby in the hospital, ask your medical team about the nutrition plan and whether your baby is receiving the recommended calories and protein. Request regular updates on feeding progress. If your baby develops lung disease or intestinal problems, ask specifically how the nutrition plan will be adjusted. Work with your hospital’s nutrition team to understand any barriers to reaching nutrition targets. Strong evidence supports prioritizing early nutrition in premature babies.
Parents and families of premature babies should understand these findings. Healthcare providers caring for premature babies need to recognize the nutrition gap and work to close it. Hospital administrators in middle-income countries should consider this evidence when allocating resources for premature infant care. Policymakers developing nutrition guidelines for premature babies should account for real-world delivery challenges.
Nutrition effects on growth appear within the first 28 days of life, as shown in this study. Babies who receive inadequate nutrition during the first two weeks show slower growth by day 28. The effects of improved nutrition may take weeks to show in growth measurements. Long-term benefits of better early nutrition may not appear until months or years later.
Frequently Asked Questions
Why do premature babies have trouble getting enough nutrition?
Premature babies’ digestive systems aren’t fully developed, so doctors must start with IV nutrition and gradually introduce stomach feeding. Serious complications like lung disease or intestinal infections make feeding even harder. Most premature babies don’t receive recommended calories and protein until after their second week of life.
How much nutrition should a premature baby get?
Premature babies should receive about 100 calories per kilogram of body weight daily, along with adequate protein. A 2026 study of 168 premature infants found most babies didn’t reach this target until day 17. The protein-to-calorie ratio also matters for proper development.
What complications make premature baby nutrition worse?
Lung disease and intestinal infections significantly reduce how much nutrition premature babies can receive. Research shows babies with lung disease received 11.7 fewer calories per kilogram, while those with intestinal infections received 33.3 fewer calories per kilogram at day 28.
How does poor nutrition affect premature baby growth?
Inadequate nutrition in the first month directly affects growth speed. A 2026 study of 168 premature babies found those receiving less nutrition grew at only 5.1 grams per kilogram per day, below recommended targets, with most babies losing weight relative to healthy newborns.
Can hospitals do better at feeding premature babies?
Even hospitals with structured feeding protocols struggle to meet nutrition targets, especially for babies with complications. Research suggests hospitals need to prioritize early nutrition, adjust plans when complications develop, and monitor actual intake versus targets closely.
Want to Apply This Research?
- If your baby is in the NICU, track daily calorie and protein intake in grams per kilogram of body weight. Record the date when your baby reaches full enteral feeding and when they reach 100 calories per kilogram per day. Note any complications like infections or breathing problems and how they coincide with feeding changes.
- Ask your medical team for a written nutrition plan with specific calorie and protein targets for each week. Request daily updates on actual intake versus targets. If your baby has complications, schedule a nutrition review meeting to discuss how the plan will adapt. Keep a simple log of feeding milestones to discuss with your care team.
- Track your baby’s weight and length measurements weekly. Compare growth velocity to expected targets for premature babies. Monitor feeding tolerance and any signs of feeding problems. Document any medical complications and their timing relative to nutrition changes. Share this information with your healthcare team at each visit.
This research describes nutritional challenges in premature babies and should not replace medical advice from your baby’s healthcare team. Nutrition plans for premature infants must be individualized based on your baby’s specific condition, weight, gestational age, and medical complications. Always consult with your neonatologist or pediatrician about your baby’s feeding plan and nutrition targets. This study was conducted in middle-income countries and may not apply to all hospital settings. The findings highlight areas for improvement but do not establish new clinical standards without review by medical professionals.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.