Morales E, Garcia-Esteban R, Guxens M, Guerra S, Mendez M, Molto-Puigmarti C, Lopez-Sabater C, Sunyer J. Effects of prolonged breastfeeding and colostrum fatty acids on allergic manifestations and infections in infancy. Clin Exp Allergy. 2012 Jun;42(6):918-28. doi: 10.1111/j.1365-2222.2012.03969.x