I need advice about orphaned kittens?

I have 5 orphaned kittens who are 4 weeks old their mother was killed when they were 2 weeks old and I have been bottle feeding them.When it is time for them to eat they will all cry alittle to let me know but there is on kitten who will attack the other kitten and I dont understand why.I feed them every 3-4 hours... show more I have 5 orphaned kittens who are 4 weeks old their mother was killed when they were 2 weeks old and I have been bottle feeding them.When it is time for them to eat they will all cry alittle to let me know but there is on kitten who will attack the other kitten and I dont understand why.I feed them every 3-4 hours so I dont understand why he does this any ideas why.
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