The Stokke Tripp Trapp Baby Set turns the iconic Tripp Trapp chair into a secure high chair for babies who can sit up unaided, typically from around six to nine months, and it can be used until the child is about three years old. The set consists of a high backrest and front rail with an integrated crotch strap; the rail is shaped so that only one leg goes through each side of the strap, keeping the baby safely seated. It attaches to the chair with tool-free assembly and is compatible with Tripp Trapp chairs manufactured after May 2006. The plastic parts can be wiped down with a mild soap and water solution and are dishwasher safe.