What is the youngest age that the hepatitis B vaccine is recommended for infants and children?

The hepatitis B vaccine is recommended for infants and children starting at birth. This early vaccination is crucial because hepatitis B is a viral infection that can lead to serious health issues, including chronic liver disease and liver cancer. The vaccine is typically administered within the first 24 hours of life to provide immediate protection, especially since infants can contract the virus from infected mothers during delivery. By vaccinating at birth, the healthcare system can significantly reduce the incidence of hepatitis B among the population.

The other options suggest later ages for vaccination, which do not align with the recommended guidelines. Waiting until 1 year, 6 months, or 4 weeks could leave infants vulnerable to the virus during a critical period shortly after birth when they are at higher risk of transmission. Thus, starting the vaccination series at birth is a key public health measure in the prevention of hepatitis B.