Nichole wears 12 months skirts and a few 6-9 month ones but thats because of her not wearing diapers anyumore. Normally she is in 18 months.
You just have a line backer on your hands!! nothing wrong with that!! He's adorable!!
We always used Huggies. They worked great for my son and he never pee'd through them. If he's a big boy he needs a bigger diaper. There are always those plastic pants you can put over them just in case.