Vaccinations play a critical role in preventing serious diseases in infants. The immunization schedule typically includes vaccines for Hepatitis B, Diphtheria, Tetanus, and Pertussis (DTaP), Haemophilus influenzae type B (Hib), Polio (IPV), Pneumococcal disease (PCV13), Rotavirus, Measles, Mumps, and Rubella (MMR), and Varicella (chickenpox). Following the recommended schedule ensures that infants develop immunity at the appropriate times.