I have 5 kittens. The mom wants to get away from the kitens,bt they are only 3-4wks and barely eating

This is tipical with first litters, also they are at the age of little teeth and sharp too, not comfortable when nipple feeding, just make sure food is available, they seem to do fine.
Young mothers seem most prone to this behavior.

Maybe you can give them some moistened dry kitten food this is what my mom did with her barm kitten.