Every nursery begins with a space where your baby can rest comfortably. KeaBabies 2-Pack Lyra Muslin Mini Crib Sheets for s and are designed to fit 39.5"" x 28"" pack and play mattresses and mini crib mattress 38"" x 26"" up to 5"" height. These 100% organic cotton muslin pack n play sheets fitted create a smooth, snug surface that stays securely in place.