I have just bought a balance bike for our 3 year old and she loves it, she got her balance straight away.
Her brother who has autism has been unable to ride a bike up to now, but took to his sisters wooden balance bike straight away.
I am tempted to buy him one of his own in boys colours (hers is pink trim) but I wondered if they made one for the slightly larger child. Has anyone seen one? His sisters is suitable for 2-6 years apparently, although it will adjust to make seat higher.