I think the Balder is a great little knife, but the handle is way too short for all but the smallest child to use effectively - e.g. to carve and whittle using full-power cuts I think you need a handle you can hold, including getting your little finger on. The Balder might be a good 3-finger knife for an adult for food prep, gutting rabbits and fine carving, but as a scaled-down "proper" knife for children I think it is lacking.
My reason for this view is that I had one until recently and, with the blade appropriately taped up, tried it for size in my 6 year old son's fist. Not because I wanted him to be able to use it right now, but I wondered if it would make a decent first fixed blade in a couple of years time. The handle was already completely covered by his hand, so already no good, in my opinion.
There must be better choices out there. Buy a stick-tang blade and fit your own handle, perhaps? The Balder's blade is good, but the handle lets it down.
Just my opinion, of course
Rat