Our 1st time cat mom, Cami, just had 6 kittens. After 48 hours their are only 2 alive. She seems to be a great mother, very protective. Why did so many die? Could it have been the stress of a recent move? The kittens appeared normal. What are the chances the last 2 will survive? They have been kept alone the whole time and Cami is eating & drinking well.