Expensive but worth it.
My son used a balance bike when he was 3 years old which he got used to. This summer he turned 4, so we wanted to have him transition to a pedal bike. We tried a normal cheaper bike but it was pretty heavy for him to handle and the fact that it was coaster break bike just wasn't very good to handle plus the weight, and his tendency to pedal backwards..... So we got this bike which is very light and has hand brakes. It was incredible, he was able to pedal and balance it on his own the same day for shorts lengths at a time. After some practice over he got pretty proficient, making turns and breaking.