We have a h23 and sail on an inland lake. Is it safe to let the kids play down below without a pfd on and make them put it on when they come up to the cockpit. We are not dealing with any waves due to the size of the lake.
If you're not "rockin and rollin" it should be fine. How steady is the little one on his/her feet?
Watch out for the companionway ladder (if you have one).