The current ® Baby Set as well as the Newborn Set are compatible with all Tripp Trapp® chairs produced from May 2003. This corresponds to serial numbers starting with 3 or higher. The serial number and production date are printed on the bottom of the right side leg.
If you are unable to make out this information on your Tripp Trapp® chair, you can also measure the gap between the two back rest pieces: prior to May 2003, this measured approx. 2.5 cm, while on chairs since May 2003 it is approx. 3.5 cm. Chairs produced before May 2003 are not compatible with the current ® Baby Set and the Newborn Set. Earlier models of the Baby Set, with wooden rail, are unfortunately no longer available.