The Baby Delight Snuggle Nest Sheet is custom-designed to fit the Baby Delight Snuggle Nest Surround (sold separately) and comes in a handy two-pack for quick changing needs. Convenient and safe, the Baby Delight Snuggle Nest Sheet completely envelopes the mattress pad without leaving loose sheets to gather around baby. The Baby Delight Snuggle Nest Sheet is for newborns and babies up to 4 months old.