That's the part I don't understand either. Why would the snake wrap it's foot? I could understand the snake climbing, because the crib was likely elevated. And the baby is probably warm, which is nice for a cold python. But why would it wrap it? A defensive bite I could see too.
All in all, I've seen more problems with dogs running loose and hurting kids than this kind of thing happen. Just a month ago my friend's puppy was killed in it's yard by a dog that got out of it's yard and jumped the fence. But you don't hear reporters crawling all over that one. Nope. Just snakes.