“Breast milk is this amazing liquid that, through millions of years of evolution, has evolved to make babies healthy, particularly their immune systems,” UCLA’s Grace Aldrovandi, the study’s lead author, said in a press release. “Our research identifies a new mechanism that contributes to building stronger, healthier babies.”
In 107 mother-infant pairs, the study examined the microbial content of the mother’s milk, the skin around the mother’s nipple, and the baby’s stool, whose bacteria represent those of the gut. As Reuters reported, the bacteria in infants’ poop were more similar to the microbes from their own mothers than those from other mothers in the study, suggesting that the bacteria are transferred from mother to child through breastfeeding.
See “The Maternal Microbiome”
This study did not examine baby health. However, previous research indicates that breastfeeding wards against obesity and aids immune-system development. Doctors recommend exclusive breastfeeding for the first six months because it is associated with a reduced risk of ear and respiratory infections, allergies, diabetes, and sudden infant death syndrome, Reuters noted.
“We’ve always assumed that most of these microbes come from the mother,” University of Minnesota gastroenterologist Alexander Khoruts told Reuters. “They found that breastfeeding is the major source of microbial transfer during the early months of life, and I think the study provides supportive evidence for the current recommendations of exclusive breastfeeding for the first six months and continued breastfeeding to 12 months.”