Here is a link with ages and levels. Scroll down to see the chart. It does give different ranges for children.
http://www.questdiagnostics.com/hcp/intguide/jsp/showintguidepage.jsp?fn=CAP_AppTSH.htm
As far as I can see they are the same as for adults:
http://thyroid.about.com/cs/testsforthyroid/a/labs2003.htm
you may want to post this question to the Ask An Expert - Pediatric Endocrinology site along with any lab values you may have