A multicentre cohort study in Pediatric Research suggests that breastfeeding during the first six months may be linked to fewer viral infections in preterm infants, emphasizing the potential immune benefits of human milk during fragile early development.
Breastfeeding through the first six months of life was linked to fewer viral infections in preterm infants in a multicentre cohort study published in Pediatric Research, adding to evidence that human milk may play a protective role during a period of fragile immune development. The study focused on infants born before term, a group that faces higher infection risk because key defences, including antibody transfer, barrier function and lung maturity, are still developing.
According to the study, preterm babies are especially vulnerable in the first year of life, when even routine viruses can trigger bronchiolitis, pneumonia, dehydration or longer hospital stays. Researchers led by Y. Kamiya, A. Takeuchi and K. Nakamura examined whether breastfeeding during early infancy was associated with a lower rate of viral illness over that period.
The biological case for a benefit is well established. Breast milk contains antibodies, immune cells, cytokines and complex sugars that help shape the infant gut and mucosal immunity. Secretory immunoglobulin A can bind pathogens in the mouth, throat and intestine, while human milk oligosaccharides may help block microbes from attaching to tissues and support helpful bacteria.
But the question is not straightforward, and the latest study fits into a wider literature that shows both possible protection and possible risks depending on the virus. Research published in The Lancet and later in the Journal of Perinatology found that cytomegalovirus can be passed through breast milk to preterm infants, with higher maternal viral load and larger volumes of fresh milk linked to greater transmission risk. Other work suggested the clinical impact may be limited in some extremely premature infants, underscoring that human milk is not a single, simple exposure.
That complexity matters because breastfeeding is bound up with many other factors that affect infection risk, including maternal health, neonatal intensive care stay, smoking exposure, household crowding, sibling contact and the severity of prematurity itself. A multicentre cohort can strengthen the picture by drawing on more than one hospital, but it still cannot prove that breast milk alone caused the lower infection rate.
The study’s focus on viral illness is particularly relevant for parents and clinicians because respiratory syncytial virus, influenza, rhinoviruses and other common pathogens can be far more serious in preterm infants than in older children. Their smaller airways and reduced lung reserve can make inflammation harder to tolerate, and gastrointestinal infections can be equally disruptive if they interfere with feeding and hydration.
Even so, the findings should be read as one piece of a broader prevention strategy rather than as a guarantee. The study description indicates an association, not a cure, and it does not provide infection-specific figures or a causal claim. For families who cannot breastfeed directly, expressed maternal milk may still offer many of the same benefits, while donor milk or specialised formula may be needed when medically appropriate. The larger message is that early nutrition and immune protection are closely linked in preterm care, and that human milk may be one important layer of defence.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
