My two year old BMI is 19.5?

my two year old is 3 foot 3 inches, and weighs 40 pounds. Is that heavy? on WEB MD it said he is in the 90th precential for his age and is headed for over weight?!
Update: everyone who see's him thinks he is 4! I am proud and happy how healthy he looks. he's not fat at all... i just wondered because my doctor suggested me to look at that on the computer!? my dad is 6 foot 7 so i am sure my son will be big!
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