Answer: The thyroid gland is responsible for producing thyroid hormone (T4 and T3), which is involved in regulation of metabolism, bowel function, heart rate, temperature sense, menstrual regularity, and other functions. The thyroid is controlled by the pituitary gland in the brain.
Explanation: Hope it helps
They could try feeding Nathan or changing his diaper. They should also check his temperature to see if he has a fever or something to that affect.
I hope this helped! :-)