Booster seats should only be used with both vehicle lap and shoulder belts. The lap belt should fit flat across a child's upper thighs and the shoulder belt should cross securely over the chest in the middle of the child's shoulder. A secure belt should lie straight without any slack or sagging and should not cause unnatural positioning to the child’s body. This positions the vehicle seat belt to be effective in a crash and is more comfortable.
The lap belt should fit flat across a child's upper thighs (not across the soft abdomen, which is more likely to be injured in a crash than bony structures like the pelvis). The shoulder belt should cross securely over the chest and the middle of a child's shoulder. This positions the vehicle seat belt to be effective in a crash and make the child more comfortable.
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