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Vaccines don’t overload babies’ immune systems, study finds
NBC News

Some parents may be afraid that babies and toddlers get too many vaccines all at once, but a new study can help put such worries to rest.

It found that kids who got more vaccines were not any more likely to get unrelated infections than kids who got fewer vaccines, or who had them spaced out more than recommended.

There was not much reason to think that vaccinating children might make them somehow more susceptible to diseases in general, but the researchers said it is important to keep testing, to reassure parents.

The new study, published Tuesday in the Journal of the American Medical Association, looks carefully not just at the number of vaccines, but at the number of antigens — the molecules that actually stimulate immune response.