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 unique design keeps pressure off a baby's developing sacrum (pelvis). The Infant Insert also provides the necessary head and neck support for comfortable carrying from day one. The Infant Insert snaps around the baby, can be adjusted as needed and placed with ease inside any Ergobaby Carrier. Cosy and protective, your baby will be perfectly cradled and cushioned.