I've seperated them to prevent any further nursing. There is nothing else I can do. As he was walking out the door with her she was in her final throws.
It was more than likely something congenital. The pregnancy was problematic, the kittens were born premature, it was a first litter to a young mother, slow to reach milestones, etc.
It's heart breaking, I know mortality rates are high in kittens, but it still weighs heavy on me. Now momma cat is to be spayed once her boobies go down completely