Wow!Almost anything!: There's a huge range of normal sizes for13-year old boys...On the cusp of puberty for some, late for others. There is a 13-year old in my pediatric practice only 4ft7in; another, 6 feet! go to cdc website @ www.Cdc.Gov; type 'growth charts' in the search box at the right upper corner of this webpage; click thru the menus until see boys charts geared for age13. 50th %tile is "average".
Answered 12/9/2013
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