I don't see any yellowing or stains as far as I can tell. I've worn it about 5 times. I'm selling it because my child has outgrown it. [Organic Material] This romper is made of organic cotton, which is gentle on a baby's skin. [Comfortable Design] The quilted design provides excellent warmth, perfect for the cold season. [Cute Details] It features a fluffy bib, which is cute and a perfect item for a baby. - Size: 50-60 - Material: Organic Cotton - Design: Quilted - Color: Gray - Features: Fluffy bib Thank you for looking.