Most infant seats come with special cushioned inserts to secure baby’s head; if not, pad the sides and the area around your baby’s head and neck with a tightly-rolled blanket. And never use inserts that don’t come with the car seat; it not only voids the warranty, but it could make baby unsafe.
Are head supports safe in car seats?
Adding padding, neck and head support, or covers to the seat. Do not use any aftermarket products with your car seat since often they were never crash-tested with these products and may alter the seat’s functions during a crash.
Why are car seat inserts not safe?
Seat covers meant to replace or cover the car seat’s original padding are not safe and should not be used. Nor should a sleeping-bag style, two-layer cover that goes both under and over a child’s body. Both are unsafe because they can affect the performance of the seat in a crash.