I'm kitting my 3.5 year old out for a balance bike. Called local bike shop to ask about their stock. Helmet- all fine. He said in his experience- 6 nieces and nephews, elbow and knee pads are never used. Kids might topple off a slow moving bike and graze a hand. They slow themselves down and don't go fast enough to injure themselves where pads might protect them.
Are they a necessity for a bike?