Which of the following situations is NOT a way in which a baby acquires normal microbiota?

A) The baby acquires the residential microbiota in the colon after the first meal.
B) Staphylococcus epidermidis is transferred from the hospital staff to the newborn after delivery.
C) microbes cross the placenta during pregnancy.
D) microorganisms grow in the respiratory tract after the baby's first breath.
E) microbes enter the nose and mouth when the baby is in the birth canal.