Ever wonder what sounds your child should be making? These documents, taken from the following website, provide great information. Information is reported separately for boys and girls.
http://www.doe.virginia.gov/special_ed/disabilities/speech_language_impairment/articulation_norms_graphic_boys_and_girls.pdf
http://www.doe.virginia.gov/special_ed/disabilities/speech_language_impairment/articulation_norms_graphic_boys_and_girls.pdf