summertime fun!

My mom and step dad have a lake house an hour from where I live and they usually go for weeks at a time in the summer to go out boating and Spending time out on the lake. We have a jet ski (just bought I haven't even seen it yet) and a tritoon boat that has a canopy over the back. I live in Tennessee but the lake is in Kentucky and the weather is usually in the 80s and 90s in the summer and I've always stayed out all day on the boat. We keep coolers of drinks and the canopy up the whole time for shade but I'm just wondering becuse I'm due mid may what I should do if I want to bring my baby starting probably in June or July onto the boat.