Chicco KeyFit 35 vs Nuna PIPA RX

Both are infant car seats — here are their published manufacturer specs side by side.

This compares published manufacturer specs — not safety or fit advice. The seat's manual, your vehicle's manual, NHTSA's tools and a certified CPST are the fit-and-safety authority; always check them before installing.

Spec	Chicco KeyFit 35	Nuna PIPA RX
Stage	Infant	Infant
Narrow (3-across)	✓	–
Extended rear-facing	–	–
FAA-approved	✓	✓
Lightweight / travel	✓	✓

Chicco KeyFit 35

4–35 lb

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Nuna PIPA RX

4–30 lb

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As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Weight ranges are the manufacturer's published limits across all modes.

How they differ

the Chicco KeyFit 35 is listed narrow (roughly ≤17″) for fitting three across a back seat; the Nuna PIPA RX isn't listed narrow

Published limits

Mode	Chicco KeyFit 35	Nuna PIPA RX
Rear-facing	4–35 lb	4–30 lb · 16–30 in
Useful life	6 yrs from manufacture	—

Chicco KeyFit 35: Rear-facing-only infant carrier: for children 4–35 lb and 32″ or less (printed limit).

Nuna PIPA RX: Rear-facing-only infant carrier: for children 4–30 lb and 16–30″. Useful life is set by the label on the base/child restraint (no printed number of years in the manual, unlike Nuna's convertible RAVA which prints 10 years).

Printed verbatim in the manufacturer's manual (Chicco KeyFit 35 (03/2020) · Nuna PIPA RX Infant Car Seat User Manual); “—” = not published for that mode, “not yet sourced” = we haven't read that manual yet, not that the seat has no limit. How we source these →

Recall record

Chicco — 2 on NHTSA's record · Nuna — 1 on NHTSA's record.

That is the record of the brand — not a verdict on these models. A recall names specific models and manufacture-date ranges, and a seat missing from the record is not "recall-free": check nhtsa.gov/recalls with the model and date of manufacture on your seat's label. Source: NHTSA, retrieved 2026-09-05.

Where to buy

Chicco KeyFit 35

See price on Amazon

Nuna PIPA RX

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FAQ

What's the difference between the Chicco KeyFit 35 and the Nuna PIPA RX?
The Chicco KeyFit 35 is narrow for 3-across, FAA-approved for aircraft, lightweight/travel; the Nuna PIPA RX is FAA-approved for aircraft, lightweight/travel. Both are infant car seats.

Which fits three across, the Chicco KeyFit 35 or the Nuna PIPA RX?
The Chicco KeyFit 35 is listed narrow (~≤17″) for 3-across; the Nuna PIPA RX isn't. Three-across fit still depends on your exact vehicle — confirm before buying.

Which is right for my car and child, the Chicco KeyFit 35 or the Nuna PIPA RX?
That depends on your specific vehicle and child — this page compares published manufacturer specs only, not fit or safety. Check the seat manual, your vehicle manual, NHTSA's car-seat finder and ideally a certified CPST before deciding.

Citing these specs? Go ahead — published manufacturer data, last verified 2026-06-11. Copy a ready-made reference:

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