What are the post-shrunk measurements of the medium size?

After 5 months of daily use, the post-shrunk measurements of medium size OsoCozy Indian Cotton prefolds are 12 1/4" (L) x 13 1/4" (W).

What are the measurements of the regular and premium? I got the medium and they are too small!

The regular size is 14.5x21 inches and the premium size is 14.5x22 inches. Both shrink down to about 13x18 after washing

Does anyone know how are thesed "bleached?" With chlorine bleach or a bleach alternative?

they are bleached with hydrogen peroxide, no chlorine used

Has anyone embroidered on these for burp cloths?

Yes, all the time! The regular 4x6x4 size is the most popular because of the white stitching. Depending on what you are embroidering, our chinese prefolds may work better for you. The indian prefolds are nice and soft, but they do quilt up a bit, which could distort your embroidery. The chinese prefolds don't quilt up as much. Here is the link for them http://www.amazon.com/OsoCozy-Chinese-Prefold-Diapers-Regular/dp/B00212QK1S/ref=sr_1_13?s=baby-products&ie=UTF8&qid=1427296431&sr=1-13