drysuit for children?

My son is 10 and starting to get into sea kayaking with me. We will be paddling mostly cold water an I would like to keep him safe. Currently we stay close to shore, he wears a wet suit, and we only paddle in the summer when the water is not really, really cold. I would love to get him out paddling sooner and more often. Does anyone know of, or have thoughts on drysuit options. Thanks a lot for your help.

Kokatat makes a Supernova drysuit for children: