Size is 0-3 Months. Includes a free matching hat! Enjoy this adorable Buffalo Check print sleep gown for your precious new arrival. Our gowns are made of a quality 95% polyester and 5% spandex blend that leaves your babe feeling super soft & incredibly cozy. The sturdy elastic at the bottom allows parents quick access for diaper changes and will keep little toes tucked in during all hours of the day and night.