Toxoid of Corynebacterium diphtheriae. 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, mumps and varicella in case they were not immunized. Breastfeeding mothers should be protected by providing recommended vaccination for adults.