The Maxi-Cosi Headrest Pillow for the Pebble/Pebble Pro/Pebble Plus gives additional comfort for your baby's head. You can use it after the baby-hugg is removed from the Pebble/Pebble Pro/Pebble Plus car seat, when your baby is between approximately 4 to 12 months old. You can also use it as a spare part for when you lost the headrest pillow in your Pebble car seat.