Many parents and family members or friends of families have questions about a child they know who they believe might have a communication impairment.  There are several resources on the web that provide useful information.  Perhaps the best place to find answers is the American Speech Language and Hearing Association (ASHA).

 
Here are some links to useful information and answers to frequently asked questions.
 
How does your child hear and talk?

This page provides the average age by which most children
learning a single language will accomplish the listed milestones
and what you can do the help them achieve these milestones

http://www.asha.org/public/speech/development/chart.htm
 
Birth to One Year

http://www.asha.org/public/speech/development/01.htm

One to Two Years

http://www.asha.org/public/speech/development/12.htm
 

Two to Three Years

http://www.asha.org/public/speech/development/23.htm

Three to Four Years

http://www.asha.org/public/speech/development/34.htm

Four to Five Years

http://www.asha.org/public/speech/development/45.htm

What is language? What is speech?

This document gives useful definitions of language, speech, articulation, voice,and fluency.

http://www.asha.org/public/speech/development/language_speech.htm

Speech Sound Disorders:  Articulation and Phonological Processes

This page defines speech sound disorders and gives some of the signs of

articulation and phonological disorders

http://www.asha.org/public/speech/disorders/SpeechSoundDisorders.htm

What should I do if I suspect my child might have a speech, language or hearing problem?

http://www.asha.org/public/speech/development/sldisorder.htm

Early Intervention in Cleft Palate

This article provides an excellent review of appropriate speech and language

early intervention goals for infants and toddlers with cleft palate

http://www.asha.org/Publications/leader/2006/060613/f060613b/