Small Underwear

[jessyoung]

You can try etsy.com for handmade ones, too!

[Mom2jandb]

Gymboree was great for my ODD when she needed small undies. ITA the Carter's are bigger and fit her quite nicely now that the gymbos are snug. I don't know about their boy undies though, just girl.

[pianissimo]

Try Tiny Undies New York (I couldn't post a link, so google it!)
They have cotton underpants in sizes 3, 6, 9, 12, 18, and 24 months.
Or you can measure her height and figure out the size.
$14.50 for 4 undies.
Good luck!

[cuddlebunny_24]

I just bought my 22 month old underwear, I got him the 2t-3t at walmart, they are a touch big, but I think if I got him anything smaller he would not fit into them, he is so chunky. Pretty sad when my not even two year old and my almost 5 year old fit into the same size underwear.