TL DR: C-section babies pick up more hospital bacteria than those born vaginally, research shows. The findings could explain the higher prevalence of asthma, allergies and other immune conditions in babies born by caesarean. By six to nine months, the differences between the two groups had levelled out.
But scientists think that the initial exposure to bacteria at the moment of birth could be a “thermostat” moment for the immune system, defining its sensitivity and which strains of bacteria trigger a response.
Please don't tldr if you're going to do it this poorly.
The new bit of this story is that the vaginal canal isn't adding anything to the microflora of the baby, and that the source is in fact fecal matter from the mother during birth.
