A newborn baby basic-with a twist. Premium Stretchy Fabric. Our top knot hats are designed with baby's comfort in mind. That's why we created them with ultra-soft, breathable fabric with just the right hint of stretch. You can feel confident that baby will feel cozy and comfortable in this darling cap. Size: Newborn 0-4 Months Adjustable Knot: An adjustable knot ensures the perfect fit from newborn to 4 months. Care: Machine wash cold. Tumble dry low heat.