The Lil Bikes category contains balance bikes that have the lowest seat setting, generally 11.5" or less and tend to be outgrown by the time the child is age 4. Keep in mind that all children are different and grow at different rates. I extend the age up to 4 years because a bunch of these balance bikes have a long range of seat adjustment. This is only to be used as a guide and in all cases you should use our sizing guide to see which bikes will fit for sure