Suitable from 4 months to 36 months. Comes with 1 shoulder strap carrier and 1 hip seat base. Back-supporting hip seat carrier that distributes weight evenly throughout lower back and shoulders to avoid bone issues on bad posture and fatigue. Removable shoulder strap carrier to allow baby feel comfortable in moving freely and explore the world without feeling enclosed. Secure and simple release system which allow for a quick slip on and immediate release. Multiple sitting positions – Front facing, parent facing, back facing and side facing.