Baby jumpers are designed to allow a baby to bounce by using his toes to push off from the ground -- a motion that delights most babies. Like walkers, doorway jumpers seem to be a great way to help boost a baby's physical growth. They aren't called bouncing babies for nothing! Most little ones love to jump.
The best age for babies to use a baby jumper depends on your own baby, how well they're able to hold their head up, how much upper body support they need, and the product you're using. However, we'd say don't put any baby in a baby jumper before they're 4 months old – just to be on the safe side. The best time to introduce a door jumper is when the baby can support his or her own head and his or herself on their feet. Typically this begins around 6 months old and most bouncers support babies up to 18 months old.