Thanks for writing to health care magic.
Global developmental delay and constipation
suggest me of hypothyroidism
. Was a thyroid profile done in your kid? Was further evaluation done.
Treatment of the basic cause is important than symptomatic treatment. Not giving high fiber diet could be the cause of constipation. Try to give high fiber diet along with plenty of water.
What is the developmental age of your kid?
What developmental mile stone are reached?
Please reply in detail so that I can help you better.