See my post at #43. I recognize that the snake most likely acted on its own. But when a baby dies and when Mom’s boyfriend is on the scene, one needs to always ask the question: Is there any possibility that the boyfriend placed the snake in the crib?
So you have opportunity. You need motive and concrete evidence, i.e., witnesses or such. Hopefully, the police (and the ME) will construct as detailed an account as possible.
I agree 100% that it needs to be considered. However, to act as if the story provided isn’t possible or likely is silly. It’s very possible.