I have the Graco Snugride Infant Car Seat with Base and the matching Stroller. The Car Seat is not secure when used with the base after your baby weighs 15 lbs or more. It tipped over numerous times while turning corners in the car, so I stopped using it. I had it fastened using the overlap belt, because I could not figure out the use of the latches. Using the base was a faster way to get the seat in and out of the backseat of our two-door car, but I wouldn't recommend using it after your child weighs 15 lbs or more.