From Education.com
For background information on language acquisition please visit these great resources:
Spark Notes:Language Acquisition and Cognition
http://www.sparknotes.com/psychology/psych101/languageandcognition/section2.rhtml
Answers.com: Language Development
http://www.answers.com/topic/language-development
Information on Receptive Language Disorder:
Autism, hearing problems, home life, abuse, prenatal health and preterm birth can all be contributing factors to problems with receptive language.