How do I adjust the harness straps for proper fit?

For rear-facing, position the harness straps at or just below the child's shoulders. For forward-facing, position them at or just above the shoulders. To check tightness, try to pinch the harness strap at the child's shoulders—if you cannot pinch any slack and your fingers slide off, the harness is tight enough. Use the harness height adjustment button at the top of the headrest to raise or lower the straps as needed.