tokens: We defined target height - related short stature ( TH - SS ) when child 's height is ≤ - 2 SDS and included in the range of target height ; suspected autosomal dominant short stature ( AD - SS ) when child height and at least one parent height are ≤ - 2 SDS ; constitutional familial short stature ( C - FSS ) when a child with TH - SS does not have any parents with height ≤ - 2 SDS .