Funny you should mention that.. I was going to suggest it would have been a little more believable and scary had the mother been maiming the victims. The root of the story really isn't the child, but the womans transformation from the submissive Christian backwoods emotionally abused wife desperate for an escape (via motherdom) to a monster -in order to get there. To me the chucky baby brought me out of the story by being so self-sufficient. It would have lent itself better to the story by appearing as completely evil while at the same time extremely vulnerable and needing of it's mother. (which was her motivation)
I haven't had a chance to really comment yet, I am hoping to get to a review and comment of all of the shorts tonight but, before this slips my mind, I want to acknowledge Ming's post as a fantastic one.
Very great thoughts, and shows that you actually looked beyond the pretty image that we can expect from such a great team and get into what's behind it.