SwaddleMe Size: M Not sold separately Used daily for about two weeks, washed frequently, due to raising twins. Size M is for babies approximately 3 to 6 months old. Please refer to the product page on online shopping sites for more details. Although it varies from child to child, my babies slept well when wearing these at night. Would you like to try them? There are no noticeable scratches or stains, but please understand that these are used items, and purchase accordingly.