The Centers for Disease Control and Prevention and the several health professional organizations state that vaccines given to a nursing mother do not affect the safety of breastfeeding for mothers or infants.[1-5] A slightly higher percentage of infants who were breastfed during or after maternal vaccination with the active quadrivalent human papillomavirus vaccine (Gardasil) had pneumonia during the 30 days after maternal vaccination, but these effects were not thought to be vaccine related. No similar data exist for the bivalent vaccine (Cervarix). Maternal vaccination with human papillomavirus vaccine is not a contraindication to breastfeeding.