Size of a normal 3 year old?

My son is 40 pounds, almost 42 inches tall, wears size 5/6 clothes, size 11/12 shoe (ranges depending on type of shoe and brand). He is already a little bigger than the girls that are a year older in his early preschool class. On top of that, the last week he is showing all of his normal signs of a growth spurt coming.

He’s already bigger than most of the kids his age and he is going to be the oldest of his class. He misses the cut off date by less than 3 weeks.

Am I overthinking this?