An excellent new movie called Microbirth delves into the way a baby's gut bacteria is
cultured during the birthing process and how this affects the baby throughout his or her life and can even affect things like cancer and heart disease risk later in life.
Babies are born with a sterile gut and (hopefully) pick up some beneficial gut bacteria from mom
during the
birthing process which allows them to begin
culturing the billions of gut bacteria that make up the micro-system of their intestines.