Sunseed is not a good feed. Most Petsmarts carry both Oxbow or Mazuri. both are excellent feed.
Now, before you run off to the pet store, separate the male from both females. chances are that your other female is also pregnant. but you will want to try to avoid a breed back with the one that just littered. If you don't have another cage, you will need to buy one.
You will also need to make sure the cage the kits are in is kit safe. the wire spacing should be no bigger than 1/2 x 1 inch. anything bigger and the kits can and will escape.
One other thing is that you may want to put the 2nd female in a cage of her own. It depends on how the two females are getting along with each other with kits in the cage. Often they will help each other, but sometimes, they will fight or harm the other female's kits.
You will need to get a gram scale and weigh the kits once a day, at the same time, every day. If they do not start gaining weight or are losing weight, by day 3, you will need to help mom feed them. I recommend that you read the FAQs in the breeding and babies section to find out what you will need to do.