Smart to trade in wife’s car?

My wife and I recently had our first child. Both of our vehicles are small, I drive a sedan while she drives a small SUV (only 1 backseat row). It has little trunk space when the seats are up. We keep the stroller in the back and it takes up all the space.

We were looking into trading it in for something a little bigger and also cheaper. Her car is paid for while mine is not. Would it be smart to trade hers in for something with more space and one that is cheaper?