K.T.
R.,
We toyed with the idea of changing nipple flow sizes, but my daughter's cranio sacral therapist made a good point regarding nipple flow sizes. If you were breastfeeding, would your nipple flow grow? He said they don't need it.
From my understanding, most people get a larger flow nipple because they add cereal to the bottle. Otherwise, the flow shouln't need to be changed. Our daughter is 9 months and uses a 1 size flow nipple. She's a good eater and has never complained about the nipple flow, because she doesn't know anything different.
Just one point of view regarding nipple flows...
K. T.