With peanut allergies on the rise, there are some very small studies that show pregnant women who consume peanut butter more than once a week and who introduce peanut butter into their baby's diet early actually increase the risk of this potentially dangerous allergy. This actually occurred in women with no family history or allergy. If you or a family member have food allergies, you may wish to discuss your dietary habits with your allergist.
Source:
Frank L, Marian A, Visser M, Weinberg E, Potter PC. Exposure to peanuts in utero and in infancy and the development of sensitization to peanut allergens in young children.
Pediatr Allergy Immunol. 1999 Feb;10(1):27-32.
