10 WEEKS? I missed the "weeks" part.. his eyes are barely open! Go ahead! Roll that pup! Roll 'em plenty. At 10 weeks he's just foolin around. I think I got distracted with all the bad pit bull info on the following posts. As a pit bull mommy myself I get a little defensive. My bad. He's too little to know how to do anything right.
Litter mates in a pup pile will not play with a dog that is too tough. If your itty bitty 10 week old puppy is growling, don't worry. Just walk away. The absolute worst punishment you can give a 10 week old puppy is no direct attention! That's how they learn naturally what is acceptable. If they're rough with their litter mates, the litter mates will go play with another pup. If you walk off when he gets pushy, he'll learn. Real obedience training really cant start for another 2-4 months depending on the dog, but you should start educating yourself on training a dog NOW. You can't expect much from the dog this young, but you can learn how they think and it will help you and your family to avoid mistakes that could give your dog the wrong idea (that he's in charge). Things like letting your dog walk through a doorway in front of you, things like stepping over the dog instead of moving him away.... Its too early to demand behavior like you would in an obedience class, but the sooner you learn how they think the better off everyone will be.
If you've never trained a dog before there is an excellent book called "catch your dog doing something right" I can't remember the author but it gives great insight to how a dog thinks and how important timing, consistency and contrast is in training a dog. Its really worth the read. The author is very gentle and its a perfect starting point.
When you're done with that book, before the dog is about 6 months old and he starts to test his limits, read the Koehler method. Koehler was not a fairy like the woman who wrote catch your dog doing something right, but in the event you have a dog who's more strong willed than you'd like Koehler will get you thinking in the right direction. He's really tough, but his golden rule is ONE properly executed correction is 1,000 times better than a thousand half-a** corrections, and he's right.