To provide immunity to placenta and breastfeeding transfer, individuals should be fully vaccinated before/after pregnancy.

• A. True
• B. False
• C. Only certain vaccines
• D. Not applicable

Answer: (A)

Passive immunity for the newborn comes from maternal antibodies transferred across the placenta during pregnancy and through breast milk after birth. Being up to date with vaccines before conception ensures high maternal antibody levels that can cross to the fetus, especially in the later stages of pregnancy. Vaccination during pregnancy can further boost these antibodies for certain diseases, enhancing what the fetus receives. After birth, vaccines given to the mother while she is breastfeeding can increase antibodies in breast milk, contributing to the infant’s protection through mucosal immunity. Because of these pathways, being fully vaccinated before pregnancy and maintaining appropriate vaccination during lactation supports immunity for the infant via both placenta and breastfeeding, so the statement is true. Some vaccines aren’t given during pregnancy, but postpartum vaccination can still provide protection to the infant through breast milk.