Search the Library Catalog for books and E-books.  Suggested subject words:

• Corsini Encyclopedia of Psychological & Behavioral Sciences
  (Ref BF 31 E 52) Four volumes. Articles on major psychological topics, arranged alphabetically. Articles include further readings and cross references to related topics. Includes a collection of biographies about major psychologists.
   
• Encyclopedia of Psychology (Ref BF 31 E52)
  8 volume set, published jointly by the American Psychological Association and Oxford University Press.
   
• Encyclopedia of Human Behavior (Ref BF 31 E5)  
  A four-volume work with alphabetically arranged articles on major topics in human psychology. Subjects covered include developmental stages, psychiatric disorders, learning and perceptual psychology, and more.
  
• Encyclopedia on Early Childhood Development is a website
  http://www.child-encyclopedia.com/en-ca/home.html

Websites for child-observations

• The Child and Family WebGuide is a directory that evaluates, describes and provides links to hundreds of sites containing child development research and practical advice. Topics are selected on the basis of parent recommendations; they cover all ages, from early child development through adolescence.

• Child and Brain: The Stages of Development
  Developmental milestones, the checkpoints along the road of life that are supposed to gauge our progress, also allow us to look from the outside in, to gauge how our brains grow to interact with the external world.

• Child Development Institute has a comprehensive list of developmental milestones for ages 1-5.

• Kids Growth.com has a comprehensive list of developmental milestones.

• University of Michigan Health System has a comprehensive list of developmental milestones