When you say ‘by about nine months’ I guess that means you’ve only just found she’s pregnant? 😀
How tall do they have to be to fit a balance bike?
It’s more about their leg length than height. We got our son’s Spesh Hot Walk in June last year when he was 19 months old. He couldn’t use it, even with the seat post cut right down so we could get the saddle down. His feet were just about on the floor but he wasn’t strong enough to hold the thing up.
None of that matters though because you can spend a few months scooting him/her around the garden on it, with you holding the bars for them. Our lad loved this and I think that he now loves riding it himself.