"reasons for not growing taller"

What if Your Child Is Noticeably Small and Slow to Grow? Do Not Overlook a Thyroid Function Test

It can be distressing when your child is noticeably smaller than other children of the same age and constantly says, "Mom, I am tired." It is hard to simply brush it off as part of growing up or a simple lack of sleep when a child seems unusually small and lethargic. Slower growth and low energy may not be simple growing pains, but an important signal from within the body.