About.com, Pediatrics
Features resources and advice about common children's health issues, with parenting and medical information about immunizations, common problems, infections, nutrition, safety, growth, and development, so that you can keep your kids safe and healthy.
http://pediatrics.about.com/

Cincinnati Children's
A not-for-profit hospital and research center pioneering breakthrough treatments, providing outstanding family-centered patient care and training health care professionals for the future.
http://www.cincinnatichildrens.org/