Maxi-Cosi Petra All-in-One
The Maxi-Cosi Petra All-in-One rear-faces up to 40 lb, forward-faces up to 65 lb, and has an expiration of 10 years, per Maxi-Cosi.
- $229.99List price
- 40 lbRear-facing to
- 65 lbHarness to
- 100 lbBooster to
Petra All-in-One: key facts
- The Maxi-Cosi Petra All-in-One rear-faces from 5 to 40 lb and 19 to 40 in tall; forward-faces with a harness from 30 to 65 lb and 34.4 to 49 in tall; works as a booster from 40 to 100 lb and 43.4 to 52 in tall, per Maxi-Cosi.
- Outgrown by height: "Rear-facing: the top of your child's head MUST be at least 1 in. (2.5 cm) below the top of the car seat's headrest. Forward-facing: the top of your child's ears MUST be below the top of the car seat's headrest. Booster: the top of your child's ears should never be above the top of the booster seat's headrest."
- It installs with 1 click LATCH connectors.
- Maxi-Cosi says it expires 10 years after the date of manufacture.
- Maxi-Cosi lists it as certified for aircraft ("This restraint is certified for aircraft use when used with the internal harness. / Booster Seat: This restraint is not certified for aircraft use, when used as a booster seat, because aircraft seats do not have shoulder belts.").
From Maxi-Cosi's manual and published specs. Always follow the limits on your seat's labels.
How the Petra All-in-One stacks up
Against the 57 all-in-one car seats we track. The shaded band is where the middle half of them fall; the dot is this one.
The same as most all-in-one car seats (10 years).
The same as most all-in-one car seats (40 lb).
Within the typical range for all-in-one car seats ($229.99 to $399.99).
Flying with the Petra All-in-One
Maxi-Cosi's label: “This restraint is certified for aircraft use when used with the internal harness. / Booster Seat: This restraint is not certified for aircraft use, when used as a booster seat, because aircraft seats do not have shoulder belts.”
What airlines say about car seats:
- American: “Each ticketed customer is allowed 1 stroller and 1 car seat to be checked free of charge” “If an unoccupied, adjoining seat is not available, the gate agent will check the safety seat to your final destination.” Source
- Alaska: “We will transport your child's car seat and stroller free of charge as checked baggage.” Source
- JetBlue: “Checking a child safety seat will not count towards your checked baggage allowance and there is no fee assessed” Source
- Spirit: “One (1) car seat will be accepted per child as checked baggage at no charge.” Source
- Frontier: “strollers and car seats can be checked for free.” Source
- Allegiant: “There is no charge for checking or gate checking one car seat per fare-paying passenger.” Source
- Breeze: “Child seats may be carried on board the aircraft if a seat has been purchased for the Infant or Child” Source
Quoted from each airline's page as of 2026-11-02.
Listed features
- Maker lists 1 click LATCH connectors
- Maker lists 8-position QuikFit one-hand adjustment and a 3-position adjustable base
- Maker states it is certified for use on an aircraft
- Maker states PureCosi fabrics are 'made without added fire retardant treatments'
Where to buy the Petra All-in-One
Prices and availability change. We may earn a commission from some links.
- New for 2026. Some specs may not be published yet.
- Check for recalls: Search the agency's recall list with the model number and date code from the label: NHTSA recall search.
- Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.
Full specs
| Maxi-Cosi Petra All-in-One | |
|---|---|
| Type | All-in-one |
| List price | $229.99 |
| Rear-facing weight | 5–40 lb |
| Rear-facing height | 19–40 in |
| Forward-facing weight | 30–65 lb |
| Forward-facing height | 34.4–49 in |
| Booster weight | 40–100 lb |
| Booster height | 43.4–52 in |
| Head rule | Rear-facing: the top of your child's head MUST be at least 1 in. (2.5 cm) below the top of the car seat's headrest. Forward-facing: the top of your child's ears MUST be below the top of the car seat's headrest. Booster: the top of your child's ears should never be above the top of the booster seat's headrest. |
| Newborn insert | Body pillow (and head pillow per maker page: 'infant head and lumbar inserts'), optional, rear-facing mode (manual accessory pages). |
| Installation | 1 click LATCH connectors |
| Load leg | No |
| Anti-rebound bar | No |
| Rotates | No |
| Harness heights | 8 |
| Recline positions | 3 |
| Aircraft label | Certified for aircraft, per the maker |
| No added flame retardants | Yes |
| Expires after | 10 years |
Compare the Petra All-in-One with
How each closest rival differs from the Petra All-in-One, from the makers' specs.
- GracoGrows4Me 4-in-1rear-facing to 40 lbforward-facing to 65 lb$229.99Compare side by side
- GracoSlimFit 3-in-1rear-facing to 40 lbforward-facing to 65 lb$229.99Compare side by side
- ChiccoFit3x ClearTex Ultra-Slim All-in-Onerear-facing to 40 lbforward-facing to 65 lb$229.99Compare side by side
- Safety 1stEverSlim 4-in-1rear-facing to 40 lbforward-facing to 65 lb$229.99Compare side by side
Petra All-in-One: questions answered
From Maxi-Cosi's published specs, last checked 2026-11-06.
Does the Maxi-Cosi Petra All-in-One rear-face longer than other all-in-one seats?
15 of the 70 all-in-one seats we track rear-face to a higher weight than its 40 lb. The highest is the Britax One4Life ClickTight All-in-One at 50 lb. NHTSA: stay rear-facing "until he or she reaches the top height or weight limit allowed by your car seat's manufacturer." (NHTSA)
Can you bring the Maxi-Cosi Petra All-in-One on a plane?
Yes, Maxi-Cosi lists it as certified for aircraft; look for the red-lettered label that says so. The FAA asks that a car seat go in a window seat so it doesn't block the aisle, and the crew will look for that label.
Petra All-in-One or Grows4Me 4-in-1: what's different?
By the makers' specs, the Petra All-in-One has no added flame retardants (maker's claim). See every spec side by side.
Is it OK to buy a used Petra All-in-One?
NHTSA publishes guidance on used car seats on its car seat page. Maxi-Cosi lists a lifespan of 10 years from manufacture for this model. Check the label and the maker's instructions, and ask your pediatrician about your child.
Still wondering? Write to us at hello@cribpicks.com and we'll look it up.
More all-in-one car seats
- Joiesaffron SI 4-in-1rear-facing to 40 lbforward-facing to 65 lb$249.99
- Safety 1stGrow and Go Extend 'n Ride LX All-in-Onerear-facing to 40 lbforward-facing to 65 lb$209.99
- EvenfloAll4Stages Slim Plus Canopy 4-in-1rear-facing to 40 lbforward-facing to 65 lb$259.99
- Safety 1stSlimRide 4-in-1rear-facing to 40 lbforward-facing to 65 lb$199.99
- GracoTriRide 3-in-1rear-facing to 40 lbforward-facing to 65 lb$199.99
- Disney BabyEverSlim 4-in-1rear-facing to 40 lbforward-facing to 65 lb$259.99
Where these specs come from
- maxicosi.com/products/petra-all-in-one-convertible-car-seat-cc458
- images.salsify.com/image/upload/s--tRFKkjH0--/itfyh2leecrqzk915q4s.pdf
Last checked 2026-11-06. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.