Thank you so, so much.
I will speak to the ped again with your suggestions in mind.
I agree with you, family history in a child who is falling off the curve even with short parents deserves a workup, xray called a bone age, tsh, free T4, thyroid antibodies(because of familiy history) cbc, cmp, celiac antibodies and a somatomedin C(this is a measurement of how growth hormone is working in the body. If his bones are delayed this is good since he has more room to grow. Also you have two kinds of autoimmune problems making him more prone to this. Talk with your pediatrician again but set up a visit for it rather than just calling