Usually they start to slim down as they get older and more mobile. We unsnapped DS's BGs around 9 months too, but actually snapped them back down from ~14-18 months before unsnapping them again. He still has plenty of growing room at 2.
We have had DS' unsnapped since he was 4 or 5 months old and they still fit. He is pretty chubby, but like PP said, he'll (hopefully) slim down soon. I can squeeze my almost 4 year old in to them (he doesn't wear them, I just tried them on him). He weighs about 40 pounds.
We unsnapped the rises on all of our diapers around that age, too. We haven't snapped them up again, but she is still fitting into all of them wonderfully. I don't think we will have to buy more because she grows out of them, like PP said.
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Howeve,r she's still 26 pounds and 31+ inches. I have the best luck with Blueberries and Happy Heinys (which I still have a snap setting left on and loads of room). I vary between snapping the rise down and unsnapping my BG, but I like her diapers to fit around her hips.
Re: Diapers for large babies
DD thinned out some after she started walking.
Howeve,r she's still 26 pounds and 31+ inches. I have the best luck with Blueberries and Happy Heinys (which I still have a snap setting left on and loads of room). I vary between snapping the rise down and unsnapping my BG, but I like her diapers to fit around her hips.