Using a LATCH System and Seat Belt at the Same Time Isn’t Safer
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It’s tempting to think that using a car seat’s LATCH system and seat belt at the same time will provide double the protection. In reality, the two systems have been shown to often work against each other in the event of a crash.
Typically, a LATCH system is only usable up to a certain weight group which is detailed in your car seat’s user manual.