Baby set for Tripp Trapp chairAround six to nine months of age, your baby will be able to start sitting up on their own. The Baby Set features a high back and a safety bar with an integrated crotch strap to comfortably and safely seat your baby at your table. Product advantages: Allows you to use the chair when your child is able to sit unaided. Provides secure support for your baby's back and keeps them securely in place. Built in crotch strap. Dishwasher safe. Fits all Tripp