That's tough because right now they would probably need a 12 inch and a 20 inch....but next year, they will need a 16 inch and a 24 inch.
DD#2 is 4.5 and tall for her age and she's riding on a 12 inch bike. She was riding the same bike last year, so I really thought she'd be ready for a 16 inch this year, but she feels very steady and secure on the 12 inch, so she's keeping it for another year.
When DD#1 was ready to upgrade from her 16 inch I was shocked when she was ready for a 24 inch at 8 years old. It would have been a complete waste to get her a 20 inch bike.
DD 07/03
DD 07/08
Our family is complete!