Cat peeing on newborn’s stuff

We have more litter boxes than cats. We’ve tried different litter. Done all the things. Even right after the litter boxes are cleaned, one of our cats will pee wherever he feels like it. He’s not sick. It’s behavioral. Well he peed in our newborns car seat and we had to get a new one. This morning woke up and he peed in her bouncer. We can’t keep having him pee on her stuff. What would you do? Have any other new parents dealt with this?