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MARY BETH KOSLAP-PETRACO, DNP(c), CPNP: Multiple vaccines are given in a single visit because we want to make sure that we protect the children as early as possible and as safely as possible.

MARK SAWYER, MD: There's no reason not to give vaccines together in a single visit. There's no problem with doing so, there's no increased risk of side effects, and the reason we do that is to make sure that babies get protected as soon as possible; otherwise parents would have to come back over and over and over again just to get the vaccines that we can now give starting at two months of age.

MARY BETH KOSLAP-PETRACO, DNP(c), CPNP: The immune system is really amazing and can sort out all of those different antigens or ingredients that are in the vaccines so the body appropriately builds the immunity to each one of those different diseases that each one of those separate vaccines is designed to protect against.