Reading through your posts... this isn’t an untrained dog, untrained is pulling on a lead, doesn’t sit when you tell it, getting a bit jumpy up and over friendly with visitors.
This is a dog with some fairly serious behavioural issues...and dangerous.
They all need to stop pretending a bit of training is going to resolve anything. This is a major issue that if it had any chance of being sorted, the work needed to start months ago.
If you really really can’t move out, you need to alter your set up so you’re not around the dog at all with the baby and nobody else gets to be either. If he’s tried to bite a child while being held, there’s no reason he wouldn’t do it again in a similar situation.
One bite can kill a baby.
I’m aware that sounds over dramatic - for reference, I’m totally a dog person, had dogs with my children when they were newborns and I’ve had dogs with behavioural issues.
I opened the thread expecting it to be about someone worried about their baby being licked or some other paranoia...
This isn’t you being paranoid, if anything you’re not worried enough.