We upped one girl up about a week before her sister. We just upped it again and I am thinking about switching over my other one...she just doesn't drink all of her bottle and it takes her for.ev.er! I have tried the next size up and she does great and seems much more content. Yes, we have had two different sizes (we do currently) and we just have to pay attention to which bottle has which nipple when we are out and about. At home, however, I always have the same baby sleeping on the same side of the crib so who ever is on the left, gets the bottles lined up on the left. It's just easier for me to not think about it when they both need to eat! If you feel that your daughter is ready, go for it...at worst, you could just go back to the slower nipple (but I doubt you would need to!)
I upped my kids once it was taking forever for them to eat or when i noticed they were not eating as much because I thought they were getting tired from sucking to hard
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I up DS1's whenever he starts collapsing nipples from sucking too hard. I up DS2's whenver he starts taking forever to finish a bottle and falls asleep at the end. Usually when I up DS2 he feeds super messy for a week or so. Then he figures it out. DS1 is at level 3 going to 4 soon. DS2 just started a level 3.
Re: when did you up nipple flow?