Don't waste you money on those Chinese knock offs, you have to be extremely lucky to find a good one and I spent WAY to much money trying to get a lucky one. I finally got smart I got my son a Polaris Sportsman and he was 5yrs old at the time, was I scared and nervous, yes, but did I make sure he was being extra safe absolutely. He has to wear a helmet when riding and it's governed down to only max out at 15mph. His first year I pretty much rode on the back of it to teach him things that I thought was important to pay attention too as he earned my trust the more he got some freedom with it. Now he's 7 and he's earned enough of my trust to be able to ride it as he pleases as long as someone is watching him. Take it slow, teach them, and let them enjoy it.