What’s the best response to “your 14 months old is so fat, what are you feeding him”?

My son is heavy and tall for his age. We get allot of comments when we are outside. That includes “Look at that fat baby” “You are over feeding him” “Stop his food now” “He will be fat when he grow up, what are you feeding him”

It really hurts me and my wife. The thing is he doesn’t eat that much, we follow exact diet which his paediatrician recommended. He’s just naturally big.

Need a clever response to these comments. Thank you !

Edit: Thank you every one for your responses and kind words. My wife and I have memorized quite a few and just waiting for someone to tell us one more time that our baby is fat 😂