What immunization should be given at 4 months old?

At 4 months old, a child typically receives several immunizations that are crucial for their protection against serious diseases. These include the vaccinations that were administered at 2 months along with the addition of the Hepatitis B vaccine, which helps to provide protection against the Hepatitis B virus, a significant cause of liver disease and cancer.

At the 4-month visit, it is standard to administer doses of DTaP (diphtheria, tetanus, and pertussis), IPV (inactivated poliovirus), Hib (Haemophilus influenzae type b), and the PCV (pneumococcal conjugate vaccine). Hepatitis B is included because its vaccination schedule typically begins at birth, with additional doses at 1-2 months and again at 6-18 months. Thus, the correct answer encompasses all these vaccines, ensuring that the child is receiving comprehensive immunization coverage needed at this stage of development.

The other options do not align with the recommended immunization schedule for this age, either by offering too few vaccinations or excluding vital vaccines that are part of the standard immunization protocol for children at 4 months old.