A recent (2018) systematic review concludes that diet during pregnancy & lactation impacts the baby’s developing immune system and may reduce the risk of allergy & autoimmune disease. Probiotic supplementation was likely to reduce childhood eczema and fish oil may lower egg allergy. A strong statistical correlation with positive benefit was seen in a number of cases but most importantly, there were no reported negative effects from taking these supplements during pregnancy.
Maternal diet may reduce baby’s risk to eczema and egg allergy