Usually the mamma will take care of them just fine. I'd just keep an eye to be sure she is going to be a good mamma and take care of them. You'll see that in the first few days. As long as she stands up against the others and protects them they should be okay in your regular flock. The mamma will usually show the others to stay away from their kids in no uncertain terms - which may mean a bit of head-on fighting initially But the others will get the message.
Do you have enough space for them all where they are?
In a mobile coop I keep of fresh grass in the backyard. It's about 5'X8' this protects the bantams from my free range standards. I think I may have a problem that the other two hens still have been getting in their with her to lay every day and I've been just removing their eggs daily. I'm gonna run out there and make a new nesting box for them. Live and learn.