Is it possible for a baby to get allergic reaction from breast milk? Has anyone experienced this before? My 10 week old is severely allergic to something. His skin has these red swollen patches all over the face and body. We suspect it is either Aveeno baby soap that I have been using on him for 3 weeks or my breastmilk. Although neither of them have been introduced to him recently. But we can't think of anything different that could have caused this reaction.