Another common mistake parents make is allowing too much give in the car seat harness when buckling. The belt straps shouldn't hurt your child, but they should be snug enough that it isn't loose near the buckle, chest, or shoulders. "The National Highway Traffic Safety Administration reported that 60 percent of parents don't tighten their child's harness tight enough," Tilton told POPSUGAR.
Loose Seat Straps
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