Why shouldn't unmodified cow's milk be given to an infant under one year old?

Question

A.Infants are able to digest only breast milk.
B.It contains too much bacteria for young babaies to handle.
C.it can cause an upset stomach.
D.Most infants are allergic to it.

I chose B as my answer Can someone check my answer.

Answer 1

This question has already been answered, and yes, the answer is B.

Answer 2

okay thanks

Answer 3

B, i think