how antibody of mother's milk absorb in baby's stomack?

Answer 1

Very astute question, one that I asked in med school. There is a secretory piece on the IgA molecule that gets cleaved off during absorption. Remember that infants don't have the strong acid in their stomachs, so the proteins are not denatured like if an adult were to ingest the antibody. It does much of it's good in protecting the alimentary tract itself from becoming the source of the infection.

Answer 2

The baby absorbs food/nutrients just like you do. If the baby is taking/feeding on Colostrum they're taking in the antibody.