Where can you find height predictor for child?

You can try this height predictor: http://www.babycenter.com/child-height-predictor Apparently it predicts the height of your child by the time he or she reaches 18. Keep in mind that the result will be a "best guess" but it's still just that -- a guess. My younger brother was below the average height range for boys his age for most of his childhood. But the moment he reached puberty, his growth spurt was major.