Does anyone elses 2 year old.....?

At 2 years old their appetite is at it's strongest because they are still growing so much. A 2 year old can easily out-eat a 3 year old. So long as they're healthy foods, feed your son when he asks. I've sat and watched my daughter eat more than me for dinner at that age (she ate 1 1/2 chicken breasts, plus all the sides that go with it), and she maintained a normal healthy weight.