evidence: It might seem like a lot to see your baby getting four or five shots at once. But keep in mind that scientists study these vaccines thoroughly. They are given at what scientific research has found to be the best times to protect kids from serious diseases. These illnesses can cause serious complications, like heart disease, hearing loss, and liver damage. They can even lead to death. [...] Is it OK to delay vaccines? [...] Babies are the most likely age group to be hospitalized or die from the diseases these vaccines protect them from. This is why it's important to vaccinate your child as soon as possible. If you delay or skip vaccines, your child won't be protected from these serious illnesses when they're the most vulnerable.