[Calpernia]

I'm going to guess it was the toddler/preschooler aged boy.

I would guess the ferret if the baby was missing one toe, not four. Ferrets typically attack and run. They are bred with wiesels and that is how they keep from being bit by snakes. They go in, bite and leap back.

I can easily see this baby crying, and crying, and crying, the mother and father sleeping and the boy scared and wanting the baby to stop. My thoughts are the boy kept biting his sister to stop the noise.

[paulat]

OMG...that is sick! But not beyond comprehension. We will hear more about this case in days to come.