Cradle your baby. This soft, ERGObaby Infant Insert cushion works with any ERGObaby Carrier and must be inserted to support growing babies ranging from newborns to 4-5 months. The proprietary design keeps pressure off a baby's developing sacrum. The Infant Insert also provides the necessary head and neck support for comfortable carrying from day 1.ERGObaby Infant Insert Cushion for ERGObaby Carrier-Kids