Thank you for caring for these babies, it sounds like you're doing a great job so far. The small bowl will help with the splayed leg, and others will be along with more advice as I'm not sure how to address the problem in so young a baby. But no worries--someone will know.
You don't have to worry about them getting room to move about at this age, not until they're around two weeks or more, I would say. Then you can let them toddle around on a towel or sheet after you feed them for a little bit and then back into the nest bowl. I usually use a big plastic tub for babies with thick towels inside, but if the baby already has a leg problem you want to continue using a bowl for now. Keep checking for more information about the leg and keep up the great work.