Dogs do not do things out of spite.
First thing, a vet visit is in order, to make sure there is no urinary tract problems. Once that is ruled out, I would start at basic house training again, with NO access to the bed. Crate if you have one.
You may even have to tether him to you when you are home for a bit, and pay more attention to your dog. I know how hard that can be with a new baby, but really this is what is needed.
Good luck with the vet appointment.
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