M.M.
Hi J.! Has your daughter, besides having developmental and growth issues, had any medical challenges? IF SO, besides being tested for growth and hormone issues, you might consider having her physicians look into VITAMIN D DEFICIENCY and ANEMIA or FOOD ALLERGIES (both can be a symptom of Vitamin D Deficiency - my child had both). Could she also have an undiagnosed heart condition delaying her growth? (Not trying to scare you - just something to consider and have physicians look into.) My daughter also had a minor congenital heart condition. It was monitored by cardiac specs. from birth (annually) and told she would eventually outgrow it - not really causing her any probs. By age 6 (she was still wearing size 3T) she was anemic for 2 years "for unknown reasons" then found to have food allergies, and wanted to sleep 1/2 a day at school. She ended up having the heart surgery because she wouldn't outgrow that "minor" problem. The GREAT news is that within 10 mos., she grew from 3T to size 6 and is much more alert and thriving today.
I highly recommend the "RAST" test to determine if your child has food allergies. You can eliminate any offending foods which can cause loss of blood or protein in their stools, which can delay their growth as their body is not absorbing the nutrients their growing bodies need.
Hope this is helpful. Please feel free to contact me if I can be of further help at ____@____.com.