my girl is 6yrs old but is a bit tall for her age...almost like a 7 1/2 year old.. she needs training wheels but would she need a 12" bike or a 16"?
My girl is turning 3 next month. She is pretty tall for her age. So we wen for 16" as she might start riding sometime next year.
Note: We infact checked before ordering by going to a local walmart store.
So I feel you can go for 16" or for that you can even think off going for 20" (if it has training wheels).
Hope this helps...