Illustrated with love by Silvia Portella, your baby will be surrounded by the sweetest friends when it's time to sleep. Our sheets fit US standard crib mattresses 52 x 28 inches, and are made with soft 100% cotton sateen, 230 thread count. Our sheets are beautifully packaged to make a unique baby shower gift. ***Note: Our shipping cartons hold 10 units each, which can contain a mix of styles. Please make sure your total Rookie Humans order is divisible by 10 to accommodate this.