My 6.5 yr old and 4.5 yr old both have a Nautilus and we all love them! My #3 is almost 2.5 and still RF in a Cosco Scenera. I noticed when buckling her in the other day that her straps would come loose if I pulled firmly enough (without pushing the release button). So she's in desperate need of a new seat, but I was planning on putting her in a Nautilus as well when she was big enough. I just read the weight limit starts at 20lbs. She's 24 (and really tall for her age as well). Would you ladies go ahead and make the transition to FF in a Nautilus? I don't wanna spend money on another RF seat when she's so close to FF. Any opinions? I've also got to move my 7m old (20 lbs) into a convertible seat, he looks so squished in the infant one!