E.E.
We have a son with growth hormone deficiency. If your son has this (which requires some lengthy bloodwork and an MRI to diagnose) and you choose to treat it, it's a nightly shot.
If you think this may be the case, you may want to ask to join out the Magic List on Facebook. Here's the external website: http://www.magicfoundation.org/www/docs/108/growth_hormon...