If there eyes are still closed and they've got that velvety type coat and are sort of belly crawling around they are fuzzies. They should become pups at about 14 to 15 days old (they are fuzzies from about day 8 to day 14). Their ears will become fully upright, their coat will come in completely and their eyes will be open by the pup stage. Most baby rats will continue to nurse even though by day 20 they are usually eating mom's food and using her water bottle. Some will start trying food much earlier than this of course. I wean our pups at about day 35 or thereabouts but I know some folks are weaning them a fair bit before that and they do seem to do okay.

I'd try kitten formula for them and soft, easily digestible foods. Make sure they are pooping okay (if not wipe their butts with a soft warm cloth to encourage it but they probably are doing that just fine by themself by now). I don't know about others but whenever I've had a very unyoung, unweaned animal to care for I swear by the pure meat, pureed human baby foods. They seem to love them and have no problems with digestion. Alternately cooked chicken hearts which are super soft can provide them with tons of protien. Avoid too much greens as they can cause the runs. Multi-grain Cheerios are a great hard but not too hard cereal that all my young unweaned rats adore. Raisins are another huge fav with that age group in the colony.

Big thing is to make sure they are kept warm as they aren't fully furred yet and will be missing their mother's body heat. If they have to produce too much of their own heat through shivering it tends to burn a heck of a lot of calories they need for grow and development.