这个。。还能装哪里，后排两边一左一右呗。除非你的车大，carseat小，可以装后排
中间和边上。
booster座位没有carseat安全，可以等的话你还是等娃再大了点再说。 http://www.amazon.com/review/R3KMK5RWXY422Y/ref=cm_cr_dp_title?
--------------- http://www.babycenter.com/404_when-should-my-child-switch-from-
You can safely switch your child to a booster seat if she's at least 4 years
old and she weighs 40 pounds or more or has grown too tall for her car seat
(when her shoulders are higher than the top set of harness-strap slots in
the car seat's back). Whatever you do, don't move your child to a booster
seat simply because she's had her fourth birthday. Car seats are the safest
option, so keep using yours as long as it fits. You'll also need to check
the car seat law in your state (you can use the Child Safety Laws tool at
the National Safe Kids Campaign site to look up local regulations)
