The following websites have some great information for you:
The American Academy of Pediatrics
Most pediatricians keep up on the latest in pediatrics by using the AAP. There are topics for parents to search as well.
This site recommended by lactation consultants and if full of good info.
This site is filled with great health info. You can search various diseases/conditions, obtain vaccine info and even input your travel destinations for health advice.
Regional Poison Control Center
In addition to great info. for parents regarding their children's health, there is a section for teens to review health topics.
Great things for kids to do in the Rochester area are listed on this site.