Re: Does anyone really go birth to potty in one size?
My option isn't really up there lol. We did preemie size, then NB, then smalls til about 10 months when her first OS fit. We used smalls til almost 18 months, but I also used a lot of OS since that's what I wanted to buy. My 2 month old is in nb, OS, and Thristies Size 1 duos lol