The new Tripp Trapp has a bunch of safety features demanded, I'm assuming, by the product liability-obsessed US market, geared primarily to the early [at 6 months or so] adoption of the high chair. While Euros on the Continent have been using the Tripp Trapp mostly as is as soon as their kids could sit up by themselves, the Kinderzeat had always been marketed as being for kids "18-36 months and up."
Not anymore. New baby-friendly features include a 5-point harness [the Kinderzeat has a 3-point belt] and an optional molded plastic baby rail. [Compare this to the UK standards-compliant Babyset, which features a bentwood bracket and a higher, integrated seat rail.] Also new: baby rail-compatible seat cushions, [an option we personally never opted for].
Tripp Trapp Chair, Baby Friendly