Your six month child can just use this single high chair until they reach five years old! Sprout is an extended use chair that grows with your child and their developmental stages. Sprout has 3 levels of seat height and depth adjustment. For children from 6 months to 36 months, Sprout is a high chair with two seat height settings plus crotch post, 5-point harness and tray. Sprout converts to a youth chair for children from 3 to 5 years when the seat is adjusted to the lowest setting and crotch post, tray and straps are removed. The footrest has 4 height settings that adjust independently of seat height. The OXO Tot Sprout high chair is truly a chair for all ages.