The ERGO Baby Carrier Infant Insert allows you to carry your newborn in a more natural position with legs together - similar to the way the baby would be carried in a ring sling. This baby carrier accessory extends the life of the Ergo Baby carrier by allowing you to carry your newborn or toddler in the same carrrier. With the infant insert, you can more easily nurse your baby while on-the-go. A baby sling or baby wrap provides the best support for your newborn and with the addition of the Infant insert, your Ergo can also provide the support for the baby's developing spine. The infant insert is made from a 100% cotton poplin covering 100% cotton batting. The infant insert is typically used for newborns to 4 months. machine wash and dry on gentle cycles.