Comment by alentred
Indeed! This is an age-old method, this is what a dandy horse is for! In France, and surely many other places, you see the kids of young age on dandy horses ("draisiennes") coming to and from the school supervised by their parents. As a rite of passage towards the bicycle :)
Ditto for Germany as well. Most kids get a Puky fahrrad and they are ready to ride a cycle when the time comes.
https://mytoys.scene7.com/is/image/myToys/ext/13468895-01.jp...