The BRITAX Infant Positioning Insert may be necessary for small infants to achieve a snug fit of the harness around your child. The Infant Positioning Insert has been tested and certified for use with the following BRITAX convertible car seats: ROUNDABOUT 55, ROUNDABOUT 55 Canada, MARATHON 70, MARATHON 65, MARATHON 70-G3, MARATHON 65-G3, BOULEVARD 70, BOULEVARD 65, BOULEVARD 70-G3, BOULEVARD 65-G3, BOULEVARD 70 CS, BOULEVARD 65 CS, PAVILION 70-G3, PAVILION 65-G3, ADVOCATE 70 CS, ADVOCATE 65 CS, ADVOCATE 70-G3, and ADVOCATE 65-G3.
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