We travel often, and I am trying to make the decision between what seat to get for number 3. We fly lots, due to family being in another country. We flew home three times last month, due to 2 family emergencies and Christmas. I like the idea of just going straight into the convertible, which I would most likely get a CCO. I like the thought of a travel system for early on. I am thinking the KF 30. My girls were both smaller, Summer was 6 pounds 11 ounces and 19 inches tall. She didn't double her birth weight until 7 months old. She was 18 pounds at 1. Leah was 7 pounds 2 ounces, and 19 inches tall, I don't remember the exacts on what she weighed at when, but she is still pretty little, 33 pounds and 37 inches tall, with a 13.5 inch torso, at four years and 5 months. I also like the MR, but would like to know how it fits newbies.