How to secure a baby
We've had success with the car seat down below in the cabin in our new to us Catalina 27 for our infant who loves the motion of sailing and the engine noise. Our two year old wears his Mustang Lil Legends and does pretty well. My wife and I both have inflatables and make a point to wear them both for safety and to set an example for the little ones. One debate is what to do with the infant when he is nursing topside. He should have a jacket on but nursing is difficult/impossible with jacket on. Also leaning towards a tether for the toddler and likely lifeline netting.
For naps, the v-berth has worked out nicely at anchor as there is no open space with the insert in. We use a battery powered white noise machine.