Features At around six to nine months, your little one will be able to begin sitting upright unaided. This is when you can use the baby set to bring them to the table to join the rest of the family Tripp Trapp® Baby Set easily attaches directly to the Tripp Trapp® chair The seating rail and hi-back keep your baby safe and help them learn the important skill of sitting Suitable with the Stokke 2 harness only Fits European version Tripp Trapp® chairs produced after May 2003 Product Size (cm​/​in) W 21 cm x H 27 cm x D 42 cm ​/​ W 8.3 in x H 10.6 in x D 16.5 in Weight (kg​/​lbs) 0.6 kg ​/​ 1.3 lbs Suitable for age from 6 to 36 (months) Suitable for weight (kg​/​lbs) 15 kg ​/​ 33 lbs