• Hepatitis B
  • Pregnancy, Perinatal & Infants

An infant was vaccinated with monovalent HepB at birth. Later we gave her monovalent HepB at age 1 month and age 4 months. Did we give her the third dose too early?

Yes. Poorer immune response rates are seen in infants who complete the vaccination series prior to age 6 months. Do not count dose #3, which you gave at age 4 months. Repeat dose #3 when the infant is at least 6 months of age (no earlier than age 24 weeks).

Last reviewed: July 21, 2023

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