Which immunizations should be administered to a 4-month-old infant?

The immunizations recommended for a 4-month-old infant include the inactivated poliovirus (IPV), pneumococcal conjugate vaccine (PCV), and rotavirus vaccine (RV). At this age, infants typically receive their second dose of the IPV as part of the routine immunization schedule. The PCV is also typically administered at 2, 4, and 6 months of age to protect against pneumococcal diseases, which can result in serious infections such as meningitis and pneumonia. The rotavirus vaccine is provided to prevent severe gastroenteritis caused by rotavirus, and the second dose is usually given between 4 to 6 months of age.

These vaccines are crucial to establishing a strong immune response and protecting infants from various infectious diseases during a vulnerable period of their development. Other vaccines like MMR (measles, mumps, rubella) and varicella (chickenpox) are not typically given until the child is older, usually around 12 to 15 months for MMR and 12 to 15 months for varicella, hence they are not applicable for a 4-month-old infant.