From website: “Original Jolly Jumper® baby exerciser has provided babies with bouncing, giggling exercise since 1948. Hangs conveniently in doorways Improves balance and helps develop rhythm Develops coordination and strengthens muscles Proven quality with firm support for baby's spine Scientifically designed saddle provides superior back support and promotes easy, natural breathing Package Dimensions: 18.25" x 8.5" x 2.5" Designed for babies from approximately 3 months of age (when baby can hold head up with full neck support) to just before walking age. Maximum weight of 28 lbs or 13 kg.”