LO is 17 months old. He's in 18 month clothes right now. He'll fit 24 month clothing in the spring, probably through the summer. I just bought some 2T sleepers for next summer/fall since his 18-24 month ones should fit him through the summer. When he gets to 2T, does he stay in that size for a whole year. How does sizing work once you're out of the "month" clothes? I'm just trying to prepare for the upcoming seasons. We have some hand me down 2T's coming our way too.