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Exclusive Maternal Milk Compared With Exclusive Formula on Growth and Health Outcomes in Very-Low-Birthweight Preterm
Sarah N Taylor1, Tanis R Fenton2,3,3, Sharon Groh-Wargo4
1Division of Neonatology, Department of Pediatrics, Yale School of Medicine, New Haven, CT, United States.
Insights
Exclusive maternal milk for very-low-birthweight preterm infants showed no association with mortality or major morbidities, but a lower risk of retinopathy. Growth outcomes varied based on milk fortification.
Area of Science:
- Neonatal Nutrition
- Perinatal Medicine
- Evidence-Based Pediatrics
Background:
- Optimal nutrition is crucial for very-low-birthweight (VLBW) preterm infants.
- Associations between exclusive maternal milk and exclusive formula feeding and infant outcomes require systematic evaluation.
- Understanding these associations informs clinical practice and infant care.
Conclusions:
- The evidence regarding exclusive maternal milk versus formula in VLBW preterm infants is very uncertain due to study design limitations and bias.
- While exclusive maternal milk may reduce retinopathy risk, its impact on other outcomes and growth is not definitively established, especially for non-fortified milk.
- Further research, potentially including randomized controlled trials, is needed to establish causality.
Abstract:
As part of the Pre-B Project, a systematic review was conducted to evaluate associations between exclusive maternal milk (≥75%) intake and exclusive formula intake and growth and health outcomes in very-low-birthweight (VLBW) preterm infants. The protocols from the Academy of Nutrition and Dietetics' Evidence Analysis Center and the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) checklist were followed. Thirteen observational studies were included; 11 studies reported data that could be synthesized in a pooled analysis. The evidence is very uncertain (very low quality) about the effect of exclusive maternal milk on all outcomes due to observational study designs and risk of selection, performance, detection, and reporting bias in most of the included studies. Very-low-quality evidence suggested that providing VLBW preterm infants with exclusive maternal milk was not associated with mortality, risk of necrotizing enterocolitis, sepsis, or developing bronchopulmonary dysplasia, as compared with exclusive preterm formula, but exclusive maternal milk was associated with a lower risk of retinopathy of prematurity (very low certainty). Results may change when additional studies are conducted. There was no difference in weight, length, and head circumference gain between infants fed fortified exclusive maternal milk and infants receiving exclusive preterm formula; however, weight and length gain were lower in infants fed non-fortified exclusive maternal milk. Given the observational nature of human milk research, cause-and-effect evidence was lacking for VLBW preterm infants.
Systematic Review Registration:
https://www.crd.york.ac.uk/prospero/display_record.php?RecordID=86829, PROSPERO ID: CRD42018086829.
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