Making the pedals on my kid's bike rotate when I push so he'll learn to pedal I bought a 12" bike with support wheels for my kid. He is 2.5 years old. He is not pedaling the bike, so I push the bike from the back. The bike moves forward, the wheels rotate, but the pedals do not move. Since the pedals do not move, my kid just puts his feet on them and will not pedal.

How can I make the pedals move when the wheels move so that he'll learn to pedal?
So your boy is simply sitting and not pedalling, so you push him along?  Of course he's not going to pedal when he's getting a free ride from you.

Stop Pushing!

Firstly, does he understand how a bike works?  Do you ride?  Does he see you or others riding?

You might consider going the other way, and remove the whole transmission and the training wheels.  Essentially revert the bike to a balance bike until he gets the idea that he has to push.

Something like this:


Eventually he'll realise how slow the balance bike is, and want his pedals back to go faster.  And that's awesome.