Enjoy these helpful links:
http://www.asha.org/public/speech/development/communicationdevelopment.htm
http://www.communication-nation.com/milestones.html
http://ctserc.org/initiatives/isss/SpeechLanguageDev.pdf?2fa6f942252db2ec6c621fe255459617=df2575533a4d1cbcdf0ccf8e0103f1b6
http://www.ces.ncsu.edu/depts/fcs/pdfs/fcs465.pdf