We started our kids on bikes like these, love them so much! Smart Gear Wooden Balance Bike - FREE Shipping, NO Taxes | Tikes Bikes
This way my boys learned how to ride bike.
CombiCar Base with Handlebar
Wooden Ride-on Toy - Children's Toys and Gifts
Our 4 year old still rides this daily. She stuffs toys under the seat... it's her ambulance, airplane, car, school bus, and farm tractor. She has quite the imagination. (this picture is not our daughter)
How to make a DIY Balance Bike Great design with some cool features.
primavera balance bike