Peanut butter in pregnancy, for women who were not allergic to peanuts, actually may help prevent peanut allergies in children. Since peanuts and peanut butter are good sources of protein, this may be a healthy snack for you during pregnancy. Many women also find peanut butter and jelly to be a comfort food. This can be a relief to many PB&J fans. If you or a family member have food allergies, you may wish to discuss your dietary habits with your allergist.
A. Lindsay Frazier, Carlos A. Camargo Jr, Susan Malspeis, Walter C. Willett, Michael C. Young. Prospective Study of Peripregnancy Consumption of Peanuts or Tree Nuts by Mothers and the Risk of Peanut or Tree Nut Allergy in Their Offspring. JAMA Pediatrics, 2013 DOI: 10.1001/jamapediatrics.2013.4139
American Academy of Pediatrics Committee on Nutrition. Effects of Early Nutritional Interventions on the Development of Atopic Disease in Infants and Children: The Role of Maternal Dietary Restriction, Breastfeeding, Timing of Introduction of Complementary Foods, and Hydrolyzed Formulas. Pediatrics, volume 121, number 1, January 2008, pages 183-191.
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.
Lack, G., at al. Factors Associated with the Development of Peanut Allergy in Childhood. New England Journal of Medicine, volume 348, number 11, March 2003, pages 977-985.