I've experimented both was with training wheels. I put my oldest on the Oset at 18mo. He couldn't reach the ground so I made pretty wobbly training wheels for him. He spent some time learning throttle and was always comfortable with the wobble. He flat refused to ride without the training wheels. He finally rally took to it once he moved up to a 16" at 4.5/5 after several months on a bicycle without training wheels. He had a strider and took right to a bicycles without training wheels. My daughter is 4 and has been very resistant to riding unaided. Didn't want anything to do with the strider until about 6 weeks ago. She has been riding is our clubs kids series but with lots of help. She has just graduated to a 16" and shows more signs wanting to do it on her own. I only used training wheels with her a few times so she could understand the throttle without worrying about everything else. Net result neither one really took to riding the oset until they were over 4. The are very different kids and different approaches but results were similar. If you do go the route of training wheels they are easy to make if you have access to a welder. 1" square tube about 30" long some 1/2' round bar for axles and harbor freight 10" wheels. Both them to the skid plate under the batteries. Don't make the bike too stable. It will want to tip over as it can't lean. Everything about 2 wheels is learning to manage the instability.