The HALO Bassinest newborn insert provides a narrower sleep surface to help your newborn feel more secure for a better night’s sleep. Made with breathable mesh fabric, the newborn 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. For babies up to 15 lbs. Discontinue when baby shows signs of rolling over.