As a general rule, we buy bikes too big and let them grow into them. At 4.5, a balance bike may not be amiss, or just remove the pedals of the bike he gets for a while. Sheldon Brown's recommendation to put a hand on their upper back, between the shoulder blades as they are learning to balance and pedal is excellent. Do NOT use the seat or grab on to "give them balance" as that is counter productive. Better fall when going slow and learn balance. Most important, of course, be sure they have fun, even with all the fear that comes from an expanding world! Grin.
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