I bought DS2 a Tripp Trapp, having been v pleased with DS1's. However, this version is slightly different. DS1's has a high, rounded back, and straps which fasten round the waist. I did get a wooden bar with it when I bought it, but he was quite old (maybe 11mths) so I just used the straps , which slot into the holes where the backrest bit goes, IYSWIM, and are held in place by the backrest.
DS2's TT has no harness, just a wooden bar which seems to provide rather a narrow space for seating the baby. We began using it when he was about 6mths, and he was already too big to be slipped in and out behind the bar (his thighs got stuck), so we have to yank the bar out every time whe put him in/take him out. I'm not sure this is what you're really meant to do.
I've looked on the Stocke website,and haven't seen anything like the simple harness setup we had for DS1. The baby set has a plastic bar, perhaps allowing more leeway for the baby, but which I didn't get in the "baby set" I paid for when buying the chair.
It seems to me that in a few months DS2 will not really fit behind the bar, and the TT will be unusable until he is old enough to use it w/o any restraints.
What do other MNers with TT's have/do? TIA.