I suggest getting a second opinion from another doctor from a different surgery.
The other thing I would suggest is to ask for your son to have a PET scan, but they may not do these on a child so young because they will have to inject him with a radioactive isotope.
I hope you are able to find a doctor who is a little more proactive than the one you have now.
My fingers are crossed that it is nothing serious though.
Take care.
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