How should the harness straps be positioned on my child?

For forward-facing use, the harness straps must be at or just above the child's shoulders, and the top of the child's ears must be below the top of the headrest. The chest clip should be positioned even with the child's armpits. You should not be able to pinch the harness straps at the shoulder when properly tightened.

From the official Graco Tranzitions Car Seat manual, page 10

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