Assumption disproved

Babies seem to be better at keeping their lips firmly sealed during birth than had been assumed:

It has been a longstanding assumption that birth mode and associated exposure of newborns to their mothers' vaginal microbiome during delivery greatly affects the development of babies' gut microbiome. 

To test the scientific validity of this assumption, a team of Canadian researchers has now published a study in Frontiers in Cellular and Infection Microbiology in which they examined the effect of maternal vaginal microbiome composition on the development of infants' stool microbiome at 10 days and three months after birth.

"We show that the composition of the maternal vaginal microbiome does not substantially influence the infant stool microbiome in early life," said Dr. Deborah Money, a professor of obstetrics and gynecology at the University of British Columbia and corresponding author of the study. "It does not appear that exposure to maternal vaginal microbiota at the time of vaginal birth establishes the infant stool microbiome."

It seems that breast feeding is way more significant.  I wonder if there is value in at least initial attempts at breast feeding - say, for the first few weeks at least - rather than just going to formula immediately.