Vaccines won’t overload your child’s immune system—or increase their risk of other infections

As the global antivaccination movement grows, so has the number of U.S. parents who don’t vaccinate their children on time: As of 2015, an estimated 10% to 15% didn’t follow the recommended schedules for children under 2. Now, a new study shows that at least one of their fears—that vaccines overload the immune system and increase susceptibility to other diseases—is unfounded. Researchers examined the medical records of more than 900 infants from six hospitals and clinics across the western United States between 2003 and 2013.

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