Make sure that your baby is able to support her head on her own, and support herself on her feet, before using the bouncer. This is usually at about five months or six months. Most bouncers support up to 11kg (25lb), and are suitable for children up to 18 months old. Be sure to follow the fitting instructions very carefully. Tip: Always adjust your baby door bouncer to the correct height for your baby, making sure that she can't hit her head on the doorframe.