As already stated what are you feeding & how many kits are there & what age are they ? if there old enough to be seperated from there mother & its a fairly large litter i would split them into 2 smaller groups & feed meat , dont bother handling untill they have had a good feed, smaller groups means you can also observe who is getting what food wise & sort out any smaler ones who may not be getting there share , there more likely to be the snappy ones as there simply hungry.
If your finding theres no food left after a sitting then you need to add more it could simply be