Multiple shots: we try to give as many shots as possible to keep the schedule current; many parents worry about it. There is no increased risk due to simultaneous administration of many shots. Worry about autism: this is one worry that keeps alive – worry that autism is related to vaccination: several studies have shown that there is no connection between autism and immunization. Thimerosal (mercury) is another concern: there is no relation between thimerosal and any ill-effects; moreover, the fact is that most vaccines with thimerosal have been removed except for some multidose vaccines.
Not taking vaccines carries many risks.