The American Academy of Pediatrics released the following child passenger safety guidelines in April of 2011:

Figure 1: Infant-only car safety seat

1. Infant-only seats
   • Are used for infants up to 22 to 35 pounds, depending on the model.
   • Are small and have carrying handles (and sometimes come as part of a stroller system).
   • May come with a base that can be left in the car. The seat clicks into and out of the base so you don't have to install the seat each time you use it. Parents can buy more than one base for additional vehicles.
   • Are used only for travel (not for positioning outside the vehicle).
2. Convertible seats (used rear-facing)
   • Can be used rear-facing, then 'converted' to forward-facing for older children. This means the seat can be used longer by your child. They are bulkier than infant seats, however, and do not come with carrying handles or separate bases.
   • May have higher rear-facing weight (30-40 pounds) and height limits than infant-only seats, which make them ideal for bigger babies.
   • Usually have a 5-point harness that attaches at the shoulders, at the hips, and between the legs. Older convertible seats may have an overhead shield - a padded tray-like shield that swings down over the child.
3. 3-in-1 seats (used rear-facing)
   • Can be used rear-facing, forward-facing, or as a belt-positioning booster. This means the seat may be used longer by your child.
   • Are often bigger in size so adequate space within the vehicle when rear-facing should be determined.
   • Do not have the convenience of a carrying handle or a separate base; however, they may have higher rear-facing weight (35 - 40 pounds) and height limits than infant-only seats, which make them ideal for bigger babies.

Installation tips for rear-facing seats

When using a rear-facing seat, keep the following in mind:

• Place the harnesses in your rear-facing seat in slots that are at or below your baby's shoulders.
• Ensure that the harness is snug and that the harness clip is positioned at the mid-chest level.
• Make sure the car safety seat is installed tightly in the vehicle. If you can move the seat at the belt path more than an inch side to side or front to back, it's not tight enough.
• Never place a rear-facing car safety seat in the front seat of a vehicle that has an active front passenger air bag. If the air bag inflates, it will hit the back of the car safety seat, right where your baby's head is, and could cause serious injury or death.
• Be sure you know what kind of seat belts your vehicle has. Some seat belts need locking clips to keep the belt locked into position. Locking clips come with most new car safety seats. If you're not sure, check the owner's manual that came with your vehicle. Locking clips are not needed in most newer vehicles, and some seats have built-in lock-offs to lock the belt.
• If you are using a convertible or 3-in-1 seat in the rear-facing position, make sure the seat belt is routed through the correct belt path. Check the instructions that came with the car safety seat to be sure.
• If your vehicle was made after 2002, it may come with the LATCH system, which is used to secure car safety seats. See below for information on using LATCH.
• Make sure the seat is at the correct angle so your infant's head does not flop forward. Many seats have angle indicators or adjusters that can help prevent this. If your seat does not have an angle adjuster, tilt the car safety seat back by putting a rolled towel or other firm padding (such as a pool noodle) under the base near the point where the back and bottom of the vehicle seat meet.
• Still having trouble? There may be a certified child passenger safety (CPS) technician in your area who can help. If you need installation help, see below for information on how to locate a CPS technician.