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CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
Price on Amazon.com as of 2026-11-02 17:39 UTC, and subject to change.
A convertible car seat with 2 modes: rear-facing harness 5 to 40 lb, 19 to 40 in; forward-facing harness 30 to 50 lb, 34.4 to 44 in.
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CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
The Maxi-Cosi Romi is a light 2-in-1 convertible seat: rear-facing harness for 5 to 40 lb and 19 to 40 in., and forward-facing harness for 30 to 50 lb and 34.4 to 44 in. It has no booster mode, is certified for aircraft use, and the manual sets a 10-year life from manufacture.
The Romi suits travel and second-car use, where a light seat matters more than adjustment features. Maxi-Cosi describes it as just over 9 lbs., and the tether doubles as a carrying strap. The trade-offs are a lower forward-facing limit (50 lb and 44 in., against 65 lb and 49 in. on the Petra and Pria), no booster mode, no recline positions and a harness you rethread by hand.
A research summary of Maxi-Cosi’s published specifications and manual, read . Not a hands-on test or a crash-safety rating.
This seat covers 2 stages, and a child has to meet every limit of the stage they are in. Maxi-Cosi gives it a 10-year life from the date of manufacture, so check the date label before using a hand-me-down.
| Mode | Child weight | Child height | Minimum age | Conditions |
|---|---|---|---|---|
| Rear-facing harness | 5 to 40 lb | 19 to 40 in | Not published | — |
| Forward-facing harness | 30 to 50 lb | 34.4 to 44 in | Not published | — |
A child must meet every limit for the mode they use. The labels on your seat and its manual are the final word.
Every install is a fit between one seat and one vehicle. Read both manuals, and use a free inspection station if anything is unclear.
Maxi-Cosi does not publish a width for this seat, so measure your back seat and compare it with the seat in a store before buying. It weighs 9.2 lb, which matters if you will move it between cars or carry it through an airport.
Sea Shadow – PureCosi.
The Romi manual has no recline section, so the angle comes from the install. The manual uses two level lines. For a child of 5 to 30 lb and 19 to 34.3 in., the bottom level line must be parallel with the ground. For 30 to 40 lb and 34.4 to 40 in. and sitting up unassisted, the top line applies. Only if necessary, you may place tightly rolled towels or foam pool noodles under the front of the seat, and check the padding often.
Source: Maxi-Cosi Romi Convertible Car Seat user guide (PDF)
There is no QuikFit headrest here. To change harness height, the manual has you fully loosen the straps, unhook the strap loops from the splitter plate at the back, pull the straps out of the shoulder slots and rethread them into the right slots. The sewn ends must face you and the straps must not twist. Rear-facing, the straps sit at or slightly below the shoulders; forward-facing, at or slightly above. For a small baby, the manual has a separate section on adjusting the buckle and strap length.
Source: Maxi-Cosi Romi Convertible Car Seat user guide (PDF)
The manual says the Romi is certified for aircraft use, and there is an airplane certification label on the side of the seat that some airlines may ask to see. On a plane, install it in a window seat, use only forward-facing aircraft seats, and ask for a belt extender if the lap belt is short. Forward-facing on a plane, you follow the forward-facing install steps but skip the tether steps, and you must store the lower anchor belt and tether.
Source: Maxi-Cosi Romi Convertible Car Seat user guide (PDF)
No campaign in the current NHTSA child-restraint data names this model family, and I have not run a separate review for it. Check your seat’s model number and date of manufacture before use.
Rear-facing, 5 to 40 lb and 19 to 40 in. Forward-facing, 30 to 50 lb and 34.4 to 44 in. The child outgrows each mode on reaching any one limit or failing the fit requirements.
Maxi-Cosi Romi Convertible Car Seat user guide (PDF) (opens in a new tab)
The product page describes it as just over 9 lbs., but its specification list shows a product weight of 13.5 lbs. I would confirm with Maxi-Cosi if the exact figure matters.
No. It has only rear-facing and forward-facing harness modes, ending at 50 lb and 44 in. The Pria, by contrast, adds a booster mode for 40 to 100 lb and 43.4 to 52 in.
The manual says the Romi is certified for aircraft use, with an airplane certification label on the side of the seat. Airlines may ask to see that label.
Maxi-Cosi Romi Convertible Car Seat user guide (PDF) (opens in a new tab)
Machine wash the pad separately in cold water on a gentle cycle and tumble dry separately for 10 to 12 minutes on low heat. Taking the pad off involves unthreading the chest clip, buckle and harness straps, and the manual says not to use the seat without its pad.
Maxi-Cosi Romi Convertible Car Seat user guide (PDF) (opens in a new tab)
Answers refer to the model and manual version on this page. Check the instructions supplied with your seat.
| Model | Top child weight | Seat weight | Width | Usable life |
|---|---|---|---|---|
| Romi 2-in-1 Convertible Car Seat (this seat) | 50 lb | 9.2 lb | — | 10 years |
| Sela All-in-One Convertible Car Seat | 100 lb | 27.25 lb | — | 10 years |
| Kani 4-in-1 Convertible Car Seat | 100 lb | 23.2 lb | — | 10 years |
| Pria Max+ All-in-One Convertible Car Seat | 100 lb | 16.5 lb | — | 10 years |
| Pria Max All-in-One Convertible Car Seat | 100 lb | 16.8 lb | — | 10 years |
| Pria All-in-One Convertible Car Seat | 100 lb | 16.5 lb | — | 10 years |
| Petra All-in-One Convertible Car Seat | 100 lb | 14.75 lb | — | 10 years |
Other convertible seats whose published weight and height limits overlap the Romi 2-in-1 Convertible Car Seat.
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 4–40 lb | Up to 43 in |
| Forward-facing harnessfrom 12 months | 26.5–65 lb | Up to 49 in |
$439.99Oat · Amazon price as of 2026-11-02 18:40 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–50 lb | 18–49 in |
| Forward-facing harness | 30–65 lb | 35–49 in |
6% off$329.99List price $349.99Glacier Graphite 2.0 · Amazon price as of 2026-11-02 17:37 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–50 lb | 18–49 in |
| Forward-facing harness | 30–65 lb | 35–49 in |
$399.99Stone Onyx 2.0 · Amazon price as of 2026-11-02 17:37 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | 19–40 in |
| Forward-facing harness | 30–65 lb | 34.4–49 in |
$89.98Price on coscokids.com as of 2026-10-07 05:43 UTC, subject to change
