How does a baby get oxygen and food after birth?

Once babies are born, they breathe and feed in the same manner as adults...with their noses and mouths. Their stomachs, however, are not capable of digesting solid foods; therefore, babies must be breastmilk/formula fed until they are at least 4 months of age. Introducing food before 4 months can lead to malnourishment and food Allergies.