Re: Sizing: Stacinator Stretch Day/Night
I think you'll definately be better exchanging for a medium. My DD is almost the same age, but a bit more of a chunky monkey (My DD is 11 mo & 8 days and weighs about 24 lbs, I usually can buy her medium or large CDs, depending on the rise. Her rise is about 17").
We started with a large Day/Night stretch wool Stat & it was HUGE!! Since you are hand washing wool & letting it air dry, it shouldn't shrink much at all. I ended up sizing down to a medium & it fits DD sooooo much better!!! She's even on the 2nd to smallest setting on the mediums & I haven't noticed any shrinking.