It's normal for the mother dog to have some scratches on her. I wouldn't wean them just yet. Mom will know when it's time and nurse them less often. In the mean time they can be supplemented with baby cereal. The kind of human baby cereal that is dry and you mix it with puppy formula. Get the Gerber Oatmeal cereal, try to stay away from the rice cereal because that can bind up the bowels and you don't want constipated puppies!
You can eventually switch them over to softened puppy food. Soak the food in puppy formula, let it get mushy and mix it in with the cereal. Eventually switch them completely over to mushy puppy food. Once they're completely on puppy food soak it for less time until they're eventually eating hard puppy food.
I raised
Boston Terrier puppies for quite a few years. That is what my vet had recommended and I always had healthy and happy puppies.