E. coli is usually less than 1% of a healthy gut flora, but yeah. It one of the first bacterias to move from the mother's vagina to the newborn baby, until it u

E. coli is usually less than 1% of a healthy gut flora, but yeah. It one of the first bacterias to move from the mother's vagina to the newborn baby, until it uses up the oxygen which then lets the anaerobes move in.