My B was left to supervise his infant bro in a tub full of water when he was just two. So I have no problem believing that the kids were unsupervised, or that a three year old would be allowed to give a bottle to an infant. I have a hard time imagining a three year old having enough strength to inflict serious head injury to the baby. But, if it was a glass bottle and the baby took the shots to the soft spot, it could be devastating. I know that Baby A's soft spot was still present (though tiny) when he left here at 8 months.

Nuts.