Help CenterFor Bike Levels 4 and up, your child should have at least half of their feet touching the ground when sitting on the seat, and there should be a slight bend at the elbows when holding the handlebars.
Seat adjustments can be challenging if the bolts are rusted or too tight to turn. Do your best to adjust it yourself so your child can reach the ground when on their seat. If the seat post is too long or too short for further adjustments, it could be time for a different bike, as kids whose seats are too high or low will encounter difficulties when learning to ride.