Looking for strollers that sit upright.
There's more to this - what about budget? Terrain? Reversible or non-reversible seat? And also, the position of the child depends on how they are sitting, so a good thing is to try that out, as one stroller can be comfy for one child and not really for another.
In general, I would suggest looking at reversible strollers as they are usually more upright - brand-wise, Joie or Cybex are rather nice. Also, check this article of mine about upright strollers. All the best"