It is important to secure your infant's head. Make sure the car seat is properly installed according to its instructions. Each model has different directions that must be followed carefully. Make sure the seat belt holds the car seat tightly. You may need to use a locking clip to keep the seat belt tight.
Some seat belts fit loosely and only tighten on impact.
If you have this type of seat belt, you should use a small metal locking clip with the seat belt. This clip stops the seat belt from loosening and keeps the car seat from moving. Convertible safety seats are available. This avoids having to buy an infant car seat and later a larger toddler car seat. Your child should be in a forward-facing car seat.