How much can a boy eat???

Ok, so Mr. Underweight eats like a heavy weight. What’s the deal with that?? I heard that boys eat more than girls, but check this out:
Yesterday
Breakfast: Micaiah - ½ piece of toast, 1 egg Nicolae - 1 ½ piece of toast, 1 egg
Lunch: Micaiah - ½ grilled tomato and cheese sandwich, picking off the tomato and leaving the crust Nicolae - 1 whole grilled tomato and cheese sandwich, plus Micaiah’s leftovers
Dinner: Micaiah - ½ homemade burrito Nicolae - ½ homemade burrito plus Micaiah’s left overs
The kid eats more than me and gets this little round hard belly…I didn’t think the eating thing started until they were teenagers! What am I in for???