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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 2026-11-01 20:39 UTC, and subject to change.
An all-in-one car seat with 4 modes: rear-facing harness 5 to 40 lb, 19 to 40 in; forward-facing harness 30 to 65 lb, 34.4 to 49 in; belt-positioning booster (high-back) 40 to 100 lb, 43.4 to 52 in; backless booster 40 to 100 lb, 43.4 to 57 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 Disney Baby EverSlim 4-in-1 (CC420) is a four-mode seat. Its manual lists rear-facing 5 to 40 lb and 19 to 40 in., forward-facing 30 to 65 lb and 34.4 to 49 in., high-back booster 40 to 100 lb and 43.4 to 52 in., and backless booster 40 to 100 lb and 43.4 to 57 in. Expiry: 10 years.
It suits a Disney fan who wants one seat that ends as a backless booster. The main trade-off is the lower anchor limit: forward-facing, the manual allows the LATCH belt only up to a 45 lb child, after which the vehicle belt and tether take over. The plain EverSlim 4-in-1 lists the same mode limits on its page, but it links no manual, so details such as its lower anchor limit are not published.
A research summary of Safety 1st’s published specifications and manual, read . Not a hands-on test or a crash-safety rating.
This seat covers 4 stages, and a child has to meet every limit of the stage they are in. Safety 1st 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 65 lb | 34.4 to 49 in | Not published | — |
| Belt-positioning booster (high-back) | 40 to 100 lb | 43.4 to 52 in | Not published | — |
| Backless booster | 40 to 100 lb | 43.4 to 57 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.
Safety 1st does not publish a width for this seat, so measure your back seat and compare it with the seat in a store before buying.
Vintage Disney.
When they differ, follow the manual and the labels on your seat.
The seat has 5 recline positions, and a small window on each side shows which one is set (at fully reclined Position 5 the number is hidden). Position 1 must not be used rear-facing. For a child 5 to 30 lb and 19 to 34.3 in., the bottom level line must be parallel with the ground using Positions 5 to 2. For 30 to 40 lb and 34.4 to 40 in., and only if the child can sit up unassisted, the top level line applies using Positions 4 to 2. Forward-facing and booster modes use Position 1, fully upright. Rear-facing in a side position, the seat must touch the seat in front or be as close as possible.
Forward-facing with the harness covers 30 to 65 lb and 34.4 to 49 in. The manual says not to use the lower anchors for a child over 45 lb (20 kg); above that, the vehicle belt must be used. When the vehicle has a tether anchor, the tether must always be attached, adjusted and secured in forward-facing harness mode. The LATCH belt and the vehicle belt are never used together. Rear-facing, the tether is not used. Whichever method you use, the manual says the seat must stay secured to the vehicle even when no child is in it.
Before booster use, the head pillow, body pillow and harness covers come off and the harness system is stored. To separate the backless booster, squeeze both release levers under the seat pad and pull it out of the main seat. Backless, the vehicle seat back must be upright and the child's ears must never be above the top of the vehicle seat back or headrest. The lap belt runs under both armrests, and the shoulder belt goes under the armrest on the buckle side. A shoulder belt-positioning clip is for backless mode only. The manual notes that a backless booster has no back or headrest, so any added protection depends on the vehicle.
Machine wash the pad and accessories separately in cold water on a gentle cycle, with the harness covers closed so the fastening strips are not exposed. Do not use bleach. Tumble dry separately for 10 to 12 minutes on low heat and remove right away. Harness straps are spot cleaned with warm sudsy water and checked often for wear. The cup holder posts push into the ends of the armrests and are top-rack dishwasher safe. The harness covers are optional in rear-facing and forward-facing mode and come off by undoing their fasteners.
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.
The manual lists rear-facing 5 to 40 lb and 19 to 40 in., forward-facing 30 to 65 lb and 34.4 to 49 in., high-back booster 40 to 100 lb and 43.4 to 52 in., and backless booster 40 to 100 lb and 43.4 to 57 in.
Disney Baby EverSlim 4-in-1 manual (PDF) (opens in a new tab)
Forward-facing, the manual says not to use the lower anchors for a child over 45 lb (20 kg) and to switch to the vehicle belt, with the tether attached whenever an anchor is available.
Disney Baby EverSlim 4-in-1 manual (PDF) (opens in a new tab)
Yes, with the internal harness, installed with the aircraft belt. The manual says it is not certified for aircraft use as a booster, because aircraft seats do not have shoulder belts.
Disney Baby EverSlim 4-in-1 manual (PDF) (opens in a new tab)
The manual says not to use it more than 10 years after the date of manufacture. The date labels are on the bottom of the main shell and of the backless booster.
Disney Baby EverSlim 4-in-1 manual (PDF) (opens in a new tab)
The EverSlim (CC419) page lists the same limits: rear-facing 5 to 40 lb and 19 to 40 in., forward-facing 30 to 65 lb and 34.4 to 49 in., and both boosters 40 to 100 lb and 43.4 to 52 in. It also lists a 5-position base, a 10-position headrest and the SecureTech chest clip.
Safety 1st EverSlim 4-in-1 product page (opens in a new tab)
The Disney Baby EverSlim page says its slim design fits 3 across the back seat in most vehicles, and that actual fit may vary. No width is published.
Safety 1st Disney Baby EverSlim 4-in-1 product page (opens in a new tab)
Answers refer to the model and manual version on this page. Check the instructions supplied with your seat.
Other all-in-one seats whose published weight and height limits overlap the Disney Baby EverSlim 4-in-1 Convertible Car Seat.
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | 19–40 in |
| Forward-facing harness | 30–65 lb | 34.4–49 in |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
| Backless booster | 40–100 lb | 43.4–52 in |
$229.99Fiddlehead · Amazon price as of 2026-11-01 20:39 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 |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
$129.99Deep Sea 2 · Amazon price as of 2026-11-01 20:39 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 |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
$139.99Price on safety1st.com as of 2026-10-07 05:49 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 |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
$239.98Mickey Sprinkle · Amazon price as of 2026-11-01 20:39 UTC, subject to change
