Previous research has pointed out that a good draught of such organisms seem to be healthy, as children brought up after delivery by Caesarean have a much higher incidence of atopic allergic reactions than those delivered through the birth canal. Moreover, the colonic microbiome differs across babies born by vaginal vs. abdominal routes. Many have taken this evidence to heart, and have started to paint the baby’s face with a swab marinated in vaginal secretions. A balanced editorial in the BMJ  says that such a practice should not be recommended lest the baby be inoculated with less benign organisms called Beta Strep, resident in some vaginas. But if a woman wishes to practice such a procedure, she should not be inhibited from doing so, pending a trial big enough to determine the net long-term effects.
— Richard Lilford, CLAHRC WM Director
- Neu J, & Rushing J. Cesarean versus Vaginal Delivery: Long term infant outcomes and the Hygiene Hypothesis. Clin Perinatol. 2011; 38(2): 321-31.
- Cunnington AJ, Sim K, Deierl A, et al. “Vaginal seeding” of infants born by caesarean section. BMJ. 2016; 352: i227.