factors affecting child development

Answer 1

What age levels are you concerned with?

Heredity and environment. However, the environmental factors are so many, so I searched Google under the key words "factors affecting child development" to get these possible sources:

http://www.google.com/search?client=safari&rls=en&q=factors+affecting+child+development&ie=UTF-8&oe=UTF-8

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.