Look out for secondhand Lidl ones branded as “Bsquare”. They are brilliant, and hugely hardwearing. I needed to relieve the narrow steering limits with a wood rasp, and I also fitted a rear brake easily to my daughters one. (There are lots odf steep hills here). By the age of 4 she had superb braking control, even down our local 1 in 4 hills.
(It’s pretty worrying watching your kit on a brakeless bike when it’s hilly!)
The wooden bikes are brilliant because you can also attack them with woodworking tools and attach brakes, trailers, lights..
This is the Lidl one originally moodified for a very small child unable to normally reach the ground. I have not got the rear brake fitted in these photos, but I mad a steel caliper mount which screwed easily to the rear plywood hull.
And later: