The HALO Bassinest Newborn Cuddle Insert fits snugly around your baby's body, offering the soothing comfort of a gentle cuddle for a better night's sleep. Made with breathable mesh fabric, the Cuddle Insert ensures optimal airflow to keep your baby sleeping comfortably. It's firm, flat sleep surface is designed to rest on top of the Bassinest mattress ensuring safe sleep for your baby that aligns with the AAP guidelines for safe sleep. (It is not a baby hammock). And, its sturdy hooks attach easily and securely to the Bassinest. The HALO Bassinest Newborn Insert should be the only sleep insert used with the HALO Bassinest Swivel Sleeper. For babies up to 15 lbs. Discontinue when baby shows signs of rolling over.