Search for the Measles Vaccine Virus Excretion in Breast Milk of Breastfeeding Women After Postpartum Vaccination With MMR

Inclusion Criteria: Women: * Pregnant woman * Age ≥ 18 years * Planning to breastfeed her infant (mixed feeding is allowed) * Having a negative serology for rubella during pregnancy * Negative serology for measles based on the result from local laboratory * Affiliated to a social security regimen Infants: * Informed consent form signed by the person(s) holding parental authority. * Term newborn (≥36LMP) Exclusion Criteria: Women: * Woman having a multiple pregnancy * Woman planning to get pregnant in the month following the 2nd vaccination * Woman with known or suspected HIV infection * Woman with known or suspected immunodeficiency * Woman with family history of hereditary immune deficiency * Woman not mastering enough the reading / understanding of the French language to be able to consent to participate to the study * Woman incapable to follow the procedures of the study and to respect study visits for the whole period of the study. * Woman with contraindication for MMR vaccination: * Scarce hereditary problems of fructose intolerance * Woman with history of hypersensitivity to the active substances or to any of the excipients of the vaccine * Administration of human gammaglobulins in the past 3 to 11 months depending on the dose of human globulins administered (except for Rhophylac®) * Acute severe febrile illness within 7 days prior to injection * Woman under systemic corticosteroids (prednisone, or equivalent ≥10 mg/day) within the previous 15 days or pl…