I grew up with an assortment of barn cats with one or two house cats at a time. They all grow differently (kinda like yorkies
) some stay petite, then you have your 20 pound killer cats. Your little one looks fine to me, and I'd say if he (she? I don't think i read what sex lol) is eating fine and playing then they're probably fine, but if you're nervous head to the vet.
pretty kitties!