I used this around 1 month old! There's a slight yellowing on the right shoulder. The zipper pull is a little difficult to use if it's tilted, but it was defective from when I bought it... There are no snags, and it works fine if you straighten the pull. For moms and dads struggling with babies who can't sleep at night, please give it a try ( ¨̮ ) Thank you for looking.