My baby’s appetite is insatiable

Dear Doctor, My daughter is two years old and she has always had a healthy appetite. However, I sometimes worry that she over-eats, if there is such a thing. Nothing seems to fill her. She has three meals a day and some fruit or yoghurt in between meals. Even when she’s just had a meal, she’s more than willing to eat some more should it be available. Her father insists on giving her a bite every time she asks for it but I’m worried this might be some sort of condition. Is she normal?
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Dr. Rachna Pande