One of the biggest changes is that instead of a full year schedule, the AAP has only released a partial year schedule this year. This is in anticipation of new recommendations next year for younger kids aged 6 to 24 months to get a yearly flu shot. The Advisory Committee on Immunization Practices (ACIP) and American Academy of Family Physicians (AAFP) already recommends routine flu shots for these children, and I guess the AAP just needs more time to see if this really is a good idea.
Other minor changes 'include specification of minimum ages for the final doses of several vaccines, including the diphtheria-tetanus-acellular pertussis (DTaP) vaccine, the Haemophilus influenzae type b (Hib) conjugate vaccine, the pneumococcal conjugate vaccine, and the hepatitis B vaccine.' These minimum ages include giving the final dose of:
- DTaP on or after a child's 4th birthday
- Hib and Prevnar on or after a child's 1st birthday
- Hepatitis B after a child is at least 24 weeks old
View the 2004 Immunization Schedule online.

