Go baby!
Our first was born last December and we had her out on every one of our trips this year, daysails and overnights, on our hunter 37.5. Just like adjustments at home and in your car, you can easily accommodate the new little passenger on a boat. Sailing-wise we went more gently, keeping the boat more upright than we might usually.Underway, car seat was the best place, anchored to something in the cockpit. Watch out for the sun, we have a bimini and moved her frequently to keep her out of the sun. If she is still small enough, you might be able to use one of those car seats with built-in hood.At night, we used one of the portable playpen/cribs, set on top of the salon table. Worked great and easily went on/off the boat with us.Enjoy your family on the water! It's a special place.