My 6.5 yr son is 48.5 inches and weighs 61 pounds. he is an active kid and honestly does not look chubby at all. his belly is even slim. should i be worried? his doctor never had concern. he may have gained a little b/c quarantine but he plays outsid

I would: His weight is @ 90%/age & height @ 25%/age placing him at a BMI~20.8 or in the obese range for age. His desired weight would be 40-49 lb. Docs often don't address such weight issues because there is often little they have been successful with in the past & patients often leave their practice if you bring weight issues up. If he stays this way chances are his long term health will suffer.