The Jumper is a baby exerciser for any child in the pre-walking stage. Babies will enjoy bouncing around and giggling to no end as they develop rhythm and improve their balance. Babies' muscles are strengthened and coordination further developed as they bounce their way around. The Jumper provides firm support for your baby's spine, so bones will develop properly and posture will remain upright. Provides fun and exercise as your baby gains the skills they need to develop. The jumper is safe and hangs securely from any door frame with the provided door clamp. Babies can use their Jolly Jumper Exerciser as early as 3 months (only if baby can hold head up with full neck support) to walking age, with baby's maximum weight of 28 lbs (13 kgs).