Happy Birthday Moon! You don't look a day over 4.53 billion years. Illustrated with love by Swantje Hinrichsen, this gorgeous crib sheet invites your tiny dreamer to RSVP to the sleepiest party tonight. THE DETAILS Soft to the touch, sleeping on our 100% cotton sateen crib sheet is a dream. Our high-quality fabric is made of 230 thread count and a sateen weave, which is known for its smooth and lustrous finish. Because we care about your little ones, the Moon's Birthday crib sheet is OEKO-TEX® certified and carefully crafted without harmful chemicals.