An infant sling is a type of carrier or wrap designed for carrying babies or young children close to your body. It helps support the baby's weight and keeps your hands free. Full definition
This is the best infant sling newborn babies with allergies could ask for. (abckidsinc.com)
When infant slings and cloth carriers are used for carrying, it is important to ensure that the infant's head is up and above the fabric, the face is visible, and that the nose and mouth are clear of obstructions. (parenting.stackexchange.com)