National researchers, experts and pediatric leaders annually review recommendations for immunization schedules to protect our children from diseases.  Recommendations are based on up to date scientific information.  The schedule is based on the development of the child's immune system and the need to protect the child as early as possible from the infection.  Giving multiple shots at once is an acceptable method.  Children with allergies mainly need to be aware of the source of the vaccine in the low chance that they might have an allergy to a component of the shot.  Most common is that some vaccines are made from egg (flu and yellow fever vaccines), so those with egg allergy should avoid flu vaccines made in this way.

Web sites from the American Academy of Pediatrics and the CDC are noted below and provide a vast amount of information about vaccinations.