Most baby bouncers can be used from newborn age up until baby reaches the weight limit. Depending on how high of a weight limit you have, that means that you can get up to 12 to 18 months or more. Just be careful, as a baby that can sit up on their own is a safety risk in most of these seats. If you buy a seat that converts into a toddler seat, you'll be using this seat well until baby's 2nd birthday.