Life with a newborn can be daunting enough, so the streamlined installation process of the Chicco KeyFit 30, with its one-of-a-kind, center-pull LATCH system, makes life a little easier. The base of the KeyFit 30 has an easy-to-spot level indicator. If the seat is askew, merely adjust its foot prop. While the large seat nicely accommodates babies up to 30 inches and 30 pounds, an infant insert cuddles smaller babies (up to 11 pounds). 4 to 30 pounds, up to 30 inches.