Congrats on the little one. If you are not desperate for cash, and the only reason you are selling is due to lack of time because of baby, I'd keep it if at all possible.
Having a baby does cut into your fishing time A LOT! Ive heard it will get easier to score fishing time ( i just havent reached that stage yet
) The beauty of a kayak vs a boat, is that if you want to leave it sit for a few months, and then go take it out on the rare Saturday morning, you can do that relatively easy. The motor won't give you issues, you don't need to worry about old gas or any of the problems that can happen in a boat that sits for a few months for a year. If you have only 2 hours free, it is nice to have the option to get out for some stress relief.
Of course, an extra $1,600 in your pocket is nice too
