Jealous cat and a 2-month old...help needed.

I have a 2 month old LO and 2 2.5 year old kittos. Today I found my daughter's bouncer (what she sits in most while out of our bedroom which the cats have never been allowed in) full of cat pee. I am at an absolute loss for words and I feel utterly betrayed. They have never had an issue with her, and nothing in our routine has changed. I feed them, play with them, clean their litter daily, give them treats and pets....and now I have to deal with this. I love my kittos like they're my own flesh and blood, but the fact that they marked something that is my daughter's has left me in such a state that I'm having a hard time getting over the hurt I feel. I need help. My husband is no help because he's wanted to get rid of them since day one, so turning to him to get help is not happening. I don't want to re-home and I know they aren't sick (been checked recently), so i have no idea how to go about this.