There are many opportunities for a small fragile baby to become exposed to harmful viruses and bacteria. They depend on their mother for immunity and protection while in the womb. That being said, babies are not 100% immune to those kinds of thing.
A baby’s gut environment is going to be affected by their mother. Whether or not a mother feeds their baby breast milk or formula will affect their diet and their delicate microbiota.
The mother’s diet will affect the breast milk too. This is how some kids develop different tastes in food and different natural ability to tolerate and process different foods.
