As soon as baby can sit up straight unaided you can start using the Baby Throne, which is at about 4 months. All you are doing is helping baby empty their bowels properly it is just basic physiology and gravity. As a result of this you end up using fewer nappies (diapers). The Baby Throne has received endorsements from paediatricians and world recognised paediatric surgeons as a valuable aid especially for children when transitioning from liquid to solid foods.