[lady longs]

Definitely sandys.

Definitely bamboo.

Definitely small. (my son pt'd out of his around 25 pounds!)

I did a whole thread a long time ago comparing the detailed difference b/w bamboo and cotton sandys. I think it may be helpful for you to pull it up - I highlighted differences b/w sizing, weight, absorbancy, fit, drying time, softness, stretchiness.

But, if you don't want to look up the thread...the cliff notes version is...

buy the sandys small bamboos