Perhaps you need a different approach than running after the bike. Try this. It’s a much better way to learn to ride a bike.
- Adjust the seat so the child can place both feet flat on the ground.
- Take off any training wheels.
- Take the pedals off.
Now the child can safely and confidently learn to balance and maneuver the bicycle. Once they gain some skill, simply add the pedals. Leave the seat low so they feel safe. Then after a couple weeks you can raise the seat.