Inactivated strains of type A and B Influenza virus vaccines. Both inactivated (flu shot) or attenuated (nasal spray) vaccines are compatible with breastfeeding Vaccines are usually compatible with breastfeeding either if they are formed by live, attenuated, inactivated, death strains or microorganism toxoid. Except for rubella vaccine, they are not excreted into breast milk and do not cause harm to the infant. Yellow fever vaccine has a higher risk for harm effect on infants younger than 6 months old (Consult information on a particular vaccine at our web). Breastfeeding may enhance antibody response to vaccines and cause fewer side effects as fever or anorexia. Early postpartum period is appropriate to get mothers vaccinated against measles, rubella and mumps in case they were not immunized. Breastfeeding mothers should be protected by providing recommended vaccination for adults. Eleventh WHO's Model List of Essential Drugs 2002: Compatible with breastfeeding.