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Maxi-Cosi Pria All-in-One fit guide
A 3-in-1 with machine-washable fabrics that come off without uninstalling the seat. Here's exactly which children it fits, how NHTSA rated it, and which cars it fits — including three-across.
Which children it fits
| Mode | Weight | Height | LATCH limit |
|---|---|---|---|
| Rear-facing | 4 lb – 40 lb | up to 40" | up to 50 lb on lower anchors |
| Forward-facing harness | 22 lb – 65 lb | up to 49" | up to 50 lb on lower anchors |
| Belt-positioning booster | 40 lb – 100 lb | up to 52" | up to 50 lb on lower anchors |
Weight/height limits are the seat's NHTSA-published values. Beyond the LATCH limit, install with the vehicle seat belt instead of the lower anchors. Always follow the labels on your seat and the vehicle manual.
NHTSA Ease-of-Use detail
NHTSA's Ease-of-Use rating measures how easy a seat is to install and use correctly — the single biggest factor in real-world safety, since most seats are installed wrong. It is not a crash-test score; NHTSA does not crash-rate individual car seats.
Which cars the Pria All-in-One fits three across
At 19" wide, three Pria All-in-Ones across is only realistic in the widest minivans and full-size trucks. For three-across in a normal car, see our narrowest convertible car seats.
Will it fit your exact car?
Check the Pria All-in-One against a specific vehicle — single position and three-across:
Common questions
What are the weight and height limits of the Maxi-Cosi Pria All-in-One?
Rear-facing: 4 lb–40 lb and up to 40" tall; Forward-facing harness: 22 lb–65 lb and up to 49" tall; Belt-positioning booster: 40 lb–100 lb and up to 52" tall. These are the manufacturer's NHTSA-published limits — always defer to the label on your seat.
How is the Maxi-Cosi Pria All-in-One rated by NHTSA?
NHTSA gave the Maxi-Cosi Pria All-in-One an Ease-of-Use rating of 3/5 stars, including 3/5 for vehicle-installation features. Ease-of-Use measures how easy the seat is to install and use correctly — not crash performance, which NHTSA does not rate for individual seats.
Can the Maxi-Cosi Pria All-in-One fit three across?
The Maxi-Cosi Pria All-in-One is about 19" wide. At that width, three across is only realistic in the widest minivans and trucks — test-fit first.
Sources: ratings, modes & recalls — NHTSA (pulled 2026-06-17); external width — Maxi-Cosi published spec. Informational only — built from NHTSA public car-seat ratings and published seat/vehicle dimensions. This is not a safety certification and not a substitute for the seat and vehicle manuals. Always confirm the fit and install yourself before every trip.