J.K.
This is not ment to sound rude, so please bear with me. At the age of 2 years old and the weight of 64lbs before the 10 lb weight loss, at 54 lbs. he is considered morbibly obese. If they were concerned about his thyroid or any other metabolic disorder in conjunction to his illness they would run blood work and investigate. It sounds like they are more concerned that he continue to take his medication to clear his infection. Also, it could be that your son is not hungry or interestd in food anymore due to the pain in his throat. Antibiodics are needed to cure the infection, but have some side effects. They MAY include (as I do not know what specific drug that he is on); loss of desire to eat, diarrhea, gastric upset. These are common with all antibiodics. If your child was a lower % of weight group they would be more aggressive to make sure that he is getting adequate nutrients, however fat is stored energy. So in "real terms" he has plenty of stored energy to use to help get himself well. Its more important to keep him hydrated then to worry about food. If his infection doesn't clear with the ending of his medication, get him back to the ped. and work on another game plan to cure the infection. I hope that he is feeling well VERY soon :)