This fits your. Make sure this fits by entering your model number. Cotton: Made of the softest, 100% breathable most luxurious Cotton Spandex blends. ♥ For children up to 30 lbs. Newborns up to 12 lbs. need to use with Slumber Swaddle attachment (sold separately). ♥ Standard crib mattress size 27” x 52'; fits mattresses up to 4-6' deep. The original and only all-in-one safe sleep solution. Safe sleep is simple! Helps babies sleep longer, safer and more peacefully. No need for potentially dangerous bumpers, blankets, crib tents or accessories. ♥ Free Pediatric Sleep Consultation with purchase. Allows for natural movement of your child while encouraging that baby will sleep on their back. However older children will have full range of motion including sitting up and standing up inside Sleeper. The Slumber Sleeper is designed for all types of sleepers- so no matter how your child sleeps, they will be able to move around, however the Sleeper will encourage back sleeping at any age. ♥ Perfect for fussy babies or ones suffering from colic, reflux or heightened attachment needs or sensory needs. ♥ Satisfaction Guarantee - Meets all American safety standards testing and consumer product safety commission standards, recommended by Pediatricians and recognized as being a “Hip-Healthy” product by the International Hip Dysplasia Institute. ♥ Patented fitted sheet technology helps the sheet stay on the mattress securely. Patented Snap-in-Place system offers safe sleep accessories including the Slumber Swaddle, Slumber Swan and Slumber Silkies. These accessories may be snapped in to one location making loose items in the crib a thing of the past.