Why give a newborn the hepatitis B vaccine?
Here is what the checked sources say. Each title links to the original.
Hepatitis B Vaccination at Birth: Safety, Effectiveness, and Public Health Benefit
On December 5, 2025, ACIP voted that when a mother tests negative in pregnancy, parents decide with their provider when or whether to vaccinate for hepatitis B, and if not at birth, then no earlier than 2 months. This CIDRAP-led review, published in 2026, examined studies of both the birth dose and a delayed first dose. It found strong evidence that the birth dose is safe and effective, and no improvement in safety or effectiveness with a delayed first dose. Separately, it credits infant vaccination overall with a 99% reduction in childhood hepatitis B infections.
Hepatitis B immunisation for newborn infants of hepatitis B surface antigen-positive mothers
This Cochrane review of 29 randomized trials (searches to 2004) covered only babies born to mothers infected with hepatitis B. Compared with placebo or no vaccine, the vaccine cut the babies' chance of infection by about 72% (relative risk 0.28, 95% CI 0.20 to 0.40, 4 trials). Adding hepatitis B immune globulin to the vaccine cut it further. The vaccine and immune globulin appeared safe, though few trials reported side effects in detail. These trials do not address babies whose mothers test negative.
Hepatitis B
WHO estimates 240 million people were living with chronic hepatitis B in 2024, and it caused about 1.1 million deaths, mostly from cirrhosis and liver cancer. Infection in infancy or early childhood becomes chronic in about 95% of cases, versus under 5% in adults. WHO recommends all babies get a first dose within 24 hours of birth, followed by two or three more doses at least four weeks apart. It says boosters are not usually needed after the full series and that the vaccine protects for at least 20 years, probably for life.
Hepatitis B: The Disease & Vaccine
CHOP explains why testing mothers is not a complete safety net: some tests give false negatives, about 15% of pregnant women in the US are not screened, and infection can happen after the test. CHOP says about half of US children infected in their first 10 years caught the virus from someone other than their mother, such as a family member. Separately, it notes the virus spreads through tiny amounts of blood, for example on shared towels or razors, and can survive on surfaces up to seven days. Anaphylaxis is about 1 in 600,000 doses.