The Nuna PIPA RELX Extra Base is one of the most thoughtfully engineered infant car seat bases on the market, built around an adjustable stability leg that fits center seating positions and a wider range of vehicles than most bases can accommodate — a genuine breakthrough for families who need flexibility without compromise.

True Lock Installation, Refined

The RELX base installs in 5 seconds via Nuna’s True Lock system, with a steel-reinforced rigid latch that adjusts across four positions to eliminate the gap between the base and your vehicle seat. Colored indicators on both the rigid latch and stability leg turn green when each connection is properly secured, removing any guesswork from the process. Our CPST-certified staff installs and inspects bases daily in our Portland showroom — and every Nuna purchase at Posh Baby includes a complimentary car seat safety installation and safety check by our trained staff.

Engineered for Every Stage & Every Vehicle

The bubble-free, numbered recline guides allow you to adjust the riding angle as your baby grows without uninstalling the base — four positions, all accessible on the go. The locking three-piece steel stability leg adjusts across a wide range to fit most vehicles including middle seats, while a crumple zone within the leg absorbs impact and minimizes force transferred to baby. The lockoff with easy-access belt path makes seat belt installation equally straightforward.

Compatibility

Compatible with any Nuna PIPA series infant car seat. The low-profile base and smooth platform protect your vehicle’s upholstery while making loading and unloading the infant seat easier.

Shop Nuna Pipa Series & all car seat accessories. 

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