How should I secure my infant in the swing?
Always secure the infant in the restraint system provided, and after fastening the buckles, adjust the belts using the slide adjuster at the shoulder and waist to get a snug fit. The harness straps must go into the slot that is even with or slightly above the shoulders, and you should avoid twisting the straps. Never leave the infant unattended in the swing. (Pages 12, 15)
From the official Graco Simple Sway Infant Swing manual, page 15
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