This is a Koperta swaddle. The size is S. I purchased the same Koperta swaddles in sizes S and M, and I only used the S size when my baby was a newborn. There are no noticeable stains (see photo 5), but please refrain from purchasing if you are concerned. Since it's size S, it's suitable for newborns up to about 2 months old. It's recommended for those preparing for childbirth or wanting to try a swaddle. Thank you for looking. #swaddle