Researchers from the University of Colorado surveyed 534 hospitals across the country . 93 per cent reported that they had received requests for jabs to be rescheduled . Some parents wanted to space themselves out to spare their children from getting jabbed so many times in one sitting . Others complained about possible vaccine - related neurological complications . Children in the U.S. receive around 29 vaccines for about 150 illnesses between birth and six years , based on recommendations from the CDC .
Researchers from the University of Colorado surveyed 534 doctors across the country . 93 per cent reported that they had received requests for jabs to be rescheduled . Some parents wanted to space shots out to spare their children from getting jabbed so many times in one sitting . Others worried about possible vaccine-related neurological complications . Children in the U.S. receive around 29 vaccines for about 14 illnesses between birth and six years , based on recommendations from the CDC .