The Maxi-Cosi Headrest Pillow is designed to provide extra support and comfort for your baby's head. Compatible with the Pebble Plus car seat, the Headrest Pillow can be used after removal of the baby-hug inlay (at approx. 4 months) to provide additional support and comfort for a growing baby. The Headrest Pillow is included with the Pebble car seat but can be bought as a separate accessory if the pillow is lost or appears worn over time.