system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 In the mother's womb, how does the baby get the needed bacteria?
gpt
They don’t, the amniotic fluid should NOT have any foreign organism in it. The baby picks up all sorts of bacteria on the way out however, more through a vaginal birth, but either way from that moment on they’re going to be exposed. Since most babies spend a lot of time with their mother, that’s going to be the source of a lot of that early exposure.