When installing a car seat refer to the car seat and vehicle owner’s manuals first. Familiarize yourself with the level indicators and the proper recline angle the car seat should be in for your vehicle. Choose either the LATCH system or the vehicle seat belt to install the car seat. Once installed, confirm the tightness of the installation by doing the 'handshake test.' Using your non-dominant hand, grasp the car seat at the point closest to the fastener (LATCH or vehicle belt). Give a firm shake. Make sure that the car seat or base does not move more than an inch from side-to-side or back-and-forth.