Thank you for helping them.
What a hard introduction to fostering. I do small kittens but I haven't done newborns or a queen with newborns.

You have to see that they are feeding, I would only let 2 hours go by without checking them. Kittens can fade fast.

KMR with a kitten nipple, if she won't let them feed.

And they have to be warm enough. Are you in contact with a vet that can help?

It is a big undertaking, but it will be rewarding too.

Best of Luck with the babes.