Hi ladies! We're starting to look into an umbrella stroller for LO. He's 6 months old and we're getting ready to transition him into a convertible carseat before he's 7 months. He has a heavy duty stroller with a 5 point harness that came with the carseat (the carseat just clipped into it.) We'll need a new lightweight stroller, though. The cheap ones at BabiesRUs seem great. It's really important that I be able to collapse it one-handed pretty quickly and that it not weigh very much since I have to go up and down subway steps. The only problem is that it has a 3 point harness. Is that a problem, especially for a baby so young? If so, what strollers have you found that meet all of my criteria but have a 5 point harness?