I purchased this to prevent flat head syndrome in my baby, but I didn't end up using it. 【Materials】 Cotton, Plastic Beads 【Target Age/Weight】 0 days to 10 months old (2kg - 9kg) Color: Mint Green "Maru-maru Nen-ne" (rounded sleeping) is very important for healthy spinal development. However, since babies' heads protrude in the back, they may have difficulty breathing if nothing is placed under their neck, as their chin may be pulled in too much. With the MyPillow Neo baby pillow, which can be used from 0 days old and adjusted as your baby grows, let's protect their comfortable sleep and healthy posture!