Graco SlimFit3 LX
The Graco SlimFit3 LX rear-faces up to 40 lb, forward-faces up to 65 lb, and is 16.7 in wide, per Graco. A narrow three-mode all-in-one built for tight back seats.
- $299.99List price
- 40 lbRear-facing to
- 65 lbHarness to
- 100 lbBooster to
SlimFit3 LX: key facts
- The Graco SlimFit3 LX rear-faces from 5 to 40 lb and up to 49 in tall; forward-faces with a harness from 26.5 to 65 lb and up to 49 in tall; works as a booster from 40 to 100 lb and 43 to 57 in tall, per Graco.
- Outgrown by height: "Rear-facing: top of head is at least 1” (2.5 cm) below the headrest adjustment handle. Forward-facing: top of child’s ears must be below top of headrest."
- It installs with LATCH or seat belt.
- Graco says it expires 10 years after the date of manufacture.
- Graco lists it as certified for aircraft ("This child restraint is certified for use in aircraft only when used with the internal harness system. / This child restraint is NOT certified for use in aircraft when used as a booster seat because aircrafts do not have shoulder belts.").
- It's 16.7 in wide at the widest point and weighs 19.2 lb.
From Graco's manual and published specs. Always follow the limits on your seat's labels.
How the SlimFit3 LX 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).
Below the typical range for all-in-one car seats (18.3 in to 19.5 in).
Below the typical range for all-in-one car seats (20 lb to 29.3 lb).
Within the typical range for all-in-one car seats ($229.99 to $399.99).
What sets the SlimFit3 LX apart
Measured against the 57 all-in-one car seats we compare, from each maker's published specs.
- Narrowestof the 33 all-in-one car seats with it published: 16.7 in
- 7th lightestof the 35 all-in-one car seats with it published: 19.2 lb
Next to its closest matches
- Graco 4Ever DLX 4-in-1Next to it, the SlimFit3 LX is 4.8 in narrower; 3.8 lb lighter; $20 less.
- Maxi-Cosi Pria All-in-OneNext to it, the SlimFit3 LX is 7 lb heavier; $30 more.
- Maxi-Cosi Pria MaxNext to it, the SlimFit3 LX is 2.4 lb heavier; $30 less.
Flying with the SlimFit3 LX
Graco's label: “This child restraint is certified for use in aircraft only when used with the internal harness system. / This child restraint is NOT certified for use in aircraft when used as a booster seat because aircrafts do not have shoulder belts.” It is 16.7 in wide at its widest point.
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
- Only 16.7 in wide
- Light at 19.2 lb
- Cover comes off in about 60 seconds
Worth checking
- Rear-facing limit is 40 lb
- No backless booster mode
Where to buy the SlimFit3 LX
Prices and availability change. We may earn a commission from some links.
- 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
| Graco SlimFit3 LX | |
|---|---|
| Type | All-in-one |
| List price | $299.99 |
| Rear-facing weight | 5–40 lb |
| Rear-facing height | Up to 49 in |
| Forward-facing weight | 26.5–65 lb |
| Forward-facing height | Up to 49 in |
| Booster weight | 40–100 lb |
| Booster height | 43–57 in |
| Seat weight | 19.2 lb |
| Width | 16.7 in |
| Head rule | Rear-facing: top of head is at least 1” (2.5 cm) below the headrest adjustment handle. Forward-facing: top of child’s ears must be below top of headrest. |
| Newborn insert | Head support and body support (on select models) can be used only for children weighing less than 20 lb (9 kg); rear-facing only; body support must be used if shoulders are below the lowest harness setting. |
| Installation | LATCH, seat belt |
| Load leg | No |
| Anti-rebound bar | No |
| Rotates | No |
| Harness heights | 10 |
| Recline positions | 4 |
| Aircraft label | Certified for aircraft, per the maker |
| Expires after | 10 years |
Compare the SlimFit3 LX with
How each closest rival differs from the SlimFit3 LX, from the makers' specs.
- Graco4Ever DLX 4-in-1rear-facing to 40 lbforward-facing to 65 lb$319.99
- 4.8 in wider
- 3.8 lb heavier
- $20 more
- Maxi-CosiPria All-in-Onerear-facing to 40 lbforward-facing to 65 lb$269.99
- 7 lb lighter
- $30 less
- Maxi-CosiPria Maxrear-facing to 40 lbforward-facing to 65 lb$329.99
- 2.4 lb lighter
- $30 more
- Disney BabyGrow and Go All-in-Onerear-facing to 40 lbforward-facing to 65 lb$269.99
- $30 less
SlimFit3 LX: questions answered
From Graco's published specs, last checked 2026-11-06.
Does the Graco SlimFit3 LX 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)
Will the Graco SlimFit3 LX fit three across or in a small car?
It's narrower than 97% of the all-in-one seats we track, at 16.7 in. Fit depends on your vehicle; check each seat's manual and your vehicle manual. 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.
Can you bring the Graco SlimFit3 LX on a plane?
Yes, Graco 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. It weighs 19.2 lb to carry through the airport.
SlimFit3 LX or 4Ever DLX 4-in-1: what's different?
By the makers' specs, the SlimFit3 LX lists for $20 less. See every spec side by side.
Is it OK to buy a used SlimFit3 LX?
NHTSA publishes guidance on used car seats on its car seat page. Graco 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
- Safety 1stTurn and Go 360 ST Rotating All-in-Onerear-facing to 40 lbforward-facing to 65 lb$329.99
- Maxi-CosiPria Max+ All-in-Onerear-facing to 40 lbforward-facing to 65 lb$329.99
- ChiccoOneFit LX ClearTex All-in-Onerear-facing to 40 lbforward-facing to 65 lb$329.99
- EvenfloAll4Stages Slim Plus Canopy 4-in-1rear-facing to 40 lbforward-facing to 65 lb$259.99
- Disney BabyEverSlim 4-in-1rear-facing to 40 lbforward-facing to 65 lb$259.99
- EvenfloRevolve360 Rotating All-In-Onerear-facing to 40 lbforward-facing to 65 lb$349.99
Where these specs come from
- gracobaby.com/shop/car-seats/toddler-car-seats/all-in-one-car…
- gracobaby.com/all-in-one-car-seat-comparison.html
- amazon.com/dp/B0DQLQVYBB
- newellbrands.imgix.net/0c499364-e5f9-3784-b47b-28381221978d…
Last checked 2026-11-06. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.