Because ERGObaby is very concerned about correct support of our babies, through research studies, customer feedback and working directly with newborns, ERGObaby have re-designed the ERGObaby Infant Insert. The NEW Heart2Heart design encourages healthy maturation of the spine by supporting the pelvis, hip joint, and leg position rather than putting a baby in a compromising sitting position before the spine is ready. The Heart2Heart ERGObaby Infant Insert also supports the safety of the baby's head and neck in this critical stage of development. The ERGObaby Heart2Heart Infant Insert is a specially padded and shaped cushion that can be quickly and easily placed in the carrier and readjusted as needed. This design easily enables parents to ensure that their newborn is positioned correctly on the pillow, keeping pressure off the developing sacrum, and supports the development of the spine and hips. It snaps closed around the infant, holding the baby in a cozy, protected environment close to the heart, as well as in an ergonomically correct natural sitting position. This Organic Infant Insert features soft, luxurious 100% cotton fabric in versatile Natural. Coordinates well with the ERGObaby Sport, Heart Rose, Camel, Black/Camel, Cranberry, and Organic Black Embroidery ERGObaby Carriers. For use with newborns up to 4 - 5 months (with ERGObaby carrier) 200 threads per inch 100% cotton poplin fabric 100% cotton batting Machine wash and dry on gently cycles