I think it's fine. I have stuff like that for DS this summer and he'll be 2 years old.
Ridley Run 3.1 - 4/9/11 - 34:24 - 1st race evah!
Kelly Monaghan's 5K - 5/15/11 - 3rd Place in AG
Walk the Talk 5K - 5/18/11 - 31:12 PR
Ridley Run 3.1 - 4/14/12 - 1st race of the year, 32:45
I think it's fine but I wouldn't put it on my 15 month old if he was walking. I don't like one piece outfits on walking toddlers. Kate wore stuff like that until she was 18 months, but she didn't walk until then. I didn't buy Ben anything like that for this summer and he'll be around 15 months. Just NMS, but I don't think there's anything wrong with i.
Re: PIP: Is my 15mo too old to wear this?
Kelly Monaghan's 5K - 5/15/11 - 3rd Place in AG
Walk the Talk 5K - 5/18/11 - 31:12 PR
Ridley Run 3.1 - 4/14/12 - 1st race of the year, 32:45
DS - December 2006
DD - December 2008