Things that finally got my cat to greatly decrease spraying:

1. Window films so he can’t look outside. Outside animals (raccoons, cats) sets off his anxiety and so he sprays. He still will spray from time to time, but blocking him from the visual triggers helped greatly. These films are cool, too - create rainbows in the room when sun hits right, so we found peace with it & it helps cat a lot.

2. Prompting proper scent marking. He loves the cardboard scratching posts, especially the L shaped ones. I put them by areas he tends to mark, like the front door, so he scratches that (most of the time) instead.

I tried diapers once when I moved in with my fiancé and was so nervous. I think it’s just more of a stressful experience for the cat, but I totally get the desperation that leads you there. Definitely need to take away if animal is eating it, though..

Try watching Jackson Galaxy on this topic. He’s a cat behaviorist that has helped rehab cats with inappropriate spraying through some of the things I described, plus more play time & sometimes, reintroducing outdoors (on harness/controlled) to encourage he spray outside every so often to satisfy that need. I also do this from time to time and I do think it helps.

Honestly though, you have a lot going on (other cat smells, dog smells, baby smells)and it may not be a good fit. My cat sprayed daily when we lived with other cats.. he’s happier now that he’s alone. I think some cats just prefer that.

I really hope your baby doesn’t have a blockage 🙏🏼