For a larger baby:
Use the upper harness slots and the end strap loops . Check that the loops are completely within the junction plate slots and pull on the straps to be sure the straps are secure.
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4.Inspect the harness straps from the front and back of the safety seat to be sure they are not twisted. Twisted belts can create slack in the harness straps and reduce the protection provided by the safety seat.
5.Pull on the harness straps from the front of the safety seat to be sure the straps are secure.