I had the same question for 5 oz over 9 oz when I was bottle shopping. I can't think of any good reason, but then we aren't really using them so maybe I'm not the best person to ask! lol
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If they're the same price for 9oz vs. 11oz, I'd buy the 11oz. We used Avent bottles and the two packs for the 9oz vs 11oz were the same price, but we bought the 9oz thinking that would be sufficient. I wish we would have just bought the 11oz, because many times DS would eat 9.5-10oz before bed at night and we'd have to warm up more formula to give him more. I say, go for the 11oz! You just never know if you'll have a big eater. :-)
Re: Any benefit to 9 oz bottles over 11oz?
My guys never drank more than 8oz per bottle so personally I don't see the benefit of the 11oz.
4 Fresh IVF cycles + 1 FET where embies didn't survive the thaw = 2 perfect little men!
sFET 11/9/11 - Beta 11/18 BFP!
This.
Same here - Will never drank more than 8oz at a time. And even that was only a few times!