— -- Question: My first child has food allergies. Should I avoid certain foods while I am pregnant and breastfeeding to prevent food allergy in my next child?
Answer: Food allergens do cross the placenta and into the breast milk. There is some small benefit to avoiding the very allergenic foods during pregnancy and lactation. The main foods that you'd need to avoid would be eggs, milks, soy, peanuts, tree nuts, fish and shellfish.