Welcome to Ask The Doctor. We are here to help you.
Your son might have developed fever (hypothermia).
I would advise you to see your doctor, who will check his rectal temperature and will also get his Thyroid profile done.
I would advise you to use a heater or blower to warm him. Give him hot fluids to drink, if doesn't vomits them.
You should take him to ER.
Share my opinion with your doctor, before you act upon it.
I hope it helps.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.