PBS' Child Development Tracker takes you through age six. It covers development in Language, Literacy, Math, Physical Health, Science, Social and Emotional Development, Approaches to Learning, and Creative Arts.
Helpful information on the intellectual, physical, and social-emotional development of children from Robert Myers, PhD, of the Child Development Institute. Look around for more articles on parenting topics.
Excellent articles on school-age child development.
I think this article will ease your mind about some of your child's problem behaviors and also help you recognize if your child's problems are outside of the normal range.
An online tutorial on classic child development theories by Linda Chapman, MSW.
The National Parenting Center provides this extensive list of articles on child development from several excellent authors.
Understanding normal development helps you deal with problem behaviors more effectively. Good stuff from Canadian Parents Online.