Hi! I'm wondering if you know the seat dimensions for the Thule Shine? Specifically seat back height?
Unfortunately, the manufacturer doesn't make these public, and I don't have the stroller at hand to measure. I can give you my "educated guess" if that helps - the backrest should be at about ~50-51 cm, however, you need to also count in that the canopy is right above it, and the seat is on the narrower side. That means a comfortable space for up to 2-2.5 years old, 3 years if the child is not overly tall and you don't require too much space around him or her ( and longer if the child is smaller, body-size), realistically.