2023 Chicco KeyFit 35 Review: Key Upgrades for a Popular Infant Car Seat

Chicco KeyFit 35 Infant Car Seat Seat Review

If this is your first introduction to the Chicco family, benvenuto in famiglia (oh, and it’s pronounced Key-Ko). If you have ever loved the original KeyFit 30, you’re definitely gonna love the new Chicco KeyFit 35. It incorporates all the best features of the popular KeyFit 30 and adds some new ones.

  • Rear-facing 4-35 lbs., AND 32” tall or less, AND child’s head is 1” below top of head rest
  • Easy-Extend Headrest System: 5-position, no-rethread harness adjusts with the headrest and provides an additional 1″ of  headroom compared with the KeyFit 30
  • Anti-rebound bar provides added stability and extends legroom by 1 ½”
  • Deluxe push-on lower LATCH connectors
  • SuperCinch LATCH system
  • Steel-reinforced lockoff for installations with seatbelt
  • 6-position adjustable base with liquid bubble level recline indicator
  • Effortless attachment: Intuitive click-in design provides easy, secure attachment into base
  • Euro-style belt routing for baseless installation
  • Smooth bottom base
  • Extendable, double-knit canopy provides UPF 50+ sun protection
  • Removable head and body support accommodate newborns 4-11 lbs.
  • ClearTex models are free of any chemical flame-retardants
  • Luxurious foam cushioning in the cover makes it the thickest used on any KeyFit seat
  • Travel system friendly: Click-in attachment for effortless compatibility with select Chicco strollers
  • FAA-approved for use on aircraft
  • Made in China
  • 6-year lifespan before expiration

KeyFit 35 Onyx KeyFit 35 Drift

KeyFit 35 Iris


The KeyFit 35 base is compatible with original KeyFit (22 lbs.) and KeyFit 30 car seats so if you already own one of those seats you can upgrade by purchasing a new KeyFit 35 base. On the flip side, you CANNOT use a KeyFit 35 car seat with a KeyFit 30 base. Additionally, the KeyFit 35 base is NOT compatible with the Chicco Fit2 Infant & Toddler car seat.

If you want to purchase additional KeyFit 35 bases, they are available separately for $109.99.

If visuals are your thing, here’s a chart:


No re-thread harness with 5 positions: ~6 ½”-13”
External widest point (at handle hubs): 16 5/8”
Width of base at widest point: 15 3/8”
Internal shell height: 20 ½”
Crotch strap depth: 4 ½”
Seat depth: 12”
Carrier weight: 10.6 lbs.


The KeyFit 35 base looks W I D E, but it’s not! I did some side-by-side comparisons and they are the same base, but the KF 35 has an anti-rebound bar added on.


Never fear: it’s the same easy, Chicco installation as the original KeyFit base, but now there’s an integrated anti-rebound bar. That’s a nice upgrade! The ARB provides added stability and extends the amount of legroom available for your child.

I found that if the vehicle seat back doesn’t have a lot of padding, like a middle seat that has a console in it, it didn’t install well because there wasn’t cushion into which it could compress. For this reason, the KeyFit35 did not play well with the center position of my 2011 Acura MDX. However, it installed beautifully and easily in the outboard positions.

The KF 35 also loved my Tesla Model 3 and Model X. I was so surprised because those vehicles and carseats are like oil and water. In my Model 3, I wasn’t able to get it installed behind the driver seat when I had it set to my settings; I’m 5’6″ and the carrier was firmly against the driver’s seat. My 6’5″ husband would definitely not have been able to have the carseat behind the driver. On the passenger side, I adjusted the front seat so there was enough room to get my hand down to access the release handle and there was still lots of safe legroom for the passenger. In my Model X, there was plenty of space for the driver.

For LATCH installations, Chicco uses SuperCinch, which is a system that takes a lot of the work out of the installation for you. You still have to attach the lower connectors properly, but press down on the middle of the base and pull the LATCH strap and you can feel it work for you. Cool!

For seat belt installations, there are nice, wide, orange slide lockoffs for the shoulder belt. Chicco has added steel reinforcement to the lockoff so you don’t have to worry about the lockoff stretching out over time.

Chicco does NOT allow noodles or tightly rolled towels for angle adjustment. If you need to adjust the recline angle, you must use the built-in recline foot.

Because the base is a little longer than the regular KeyFit base, be careful that no more than 4” of it hangs off the edge of your vehicle seat.

The carrier can be installed using the European belt guide on the back of the carseat just below the release handle, making the KeyFit 35 “rideshare ready”.

  • The lap belt is threaded through the belt guides on top of the carrier and buckled, then the shoulder belt is wrapped around behind the seat and placed into the Euro belt guide.
  • If your seat belt isn’t long enough to wrap around behind the carseat, don’t worry; you can still install the carrier the standard way with only the lap belt through the guides on top of the seat. But don’t discount the Euro method: my Tesla seat belts are short and as you can see in the pics and video below, I was easily able to install this carrier.
  • Do NOT attempt to route the seat belt this way while the carrier is on the base. This is strictly for baseless installations.

Here’s a video I made when it was a bazillion degrees out and I decided it was wise to wear leggings. Once you’ve practiced this technique a few times, you’ll be able to do it in under a minute.

Center LATCH installations with Non-Standard Spacing (LATCH Borrowing):

Chicco only allows lower LATCH connector installation in the center seating position when the lower anchors have a standard 11” spacing. Check your vehicle owner’s manual for LATCH positions. 

Inflatable Seat Belts

Chicco has determined that the KeyFit 35 cannot be installed with inflatable seat belts found in some Ford, Lincoln, and Mercedes vehicles.


There are 2 inserts: a newborn positioner (body pillow) and a head insert. Both are optional.

  • The newborn positioner has a weight range of 4-11 lbs. and MUST be removed at 11 lbs. if used.
  • The head insert may or may not be used, with or without the newborn positioner. The head insert isn’t thick, but it tends to stick out a little if it’s not placed on all the way.

You can see the difference the newborn positioner makes in harness height. I took the positioner out but didn’t adjust the harness height at all. In the first picture of Romeo, the harness is at his jawline. The 2nd picture without the infant positioner shows the harness properly adjusted.

Harness covers can be left on or taken off—your preference. When I put itty bitties in rear-facing only infant seats, I prefer to take the covers off because they can often be too much and I feel that’s the case here. Of course, it’s parental discretion. The harness straps are close together on this seat and you have two choices: use harness covers or pull your child’s clothing up to protect his neck.

Fit for both my preemie and large newborn dolls was excellent. The harness adjuster was smooth as silk.


Taking the well-padded cover off to wash isn’t the most fun job in the world. On a scale of 1-10, with 10 being the most difficult, I’d rate it about a 6 because it’s a workout to get the cover off around the plastic harness adjuster housing and the headrest. You don’t have to entirely remove the canopy, which is nice, but you do have to disconnect the elastics around the handle hubs and undo the toggles that attach it to the cover on the back. Tip: When it’s time to reconnect the elastics around the handle hubs, raise the canopy first, then connect the elastics. Trust me on this one!

Chicco made the fabric wipeable where you need it most: in the seat and foot area. But, you can also machine-wash the cover in the gentle cycle, then hang it to dry. I suggest rolling the cover in a towel to remove some water to help it dry faster.

Always hand-clean the harness, no matter how nasty it gets. I show you how to do it here.

Harness curl: watch for harness twist starting at the hip. Even though Chicco uses a nice, thick harness strap, the buckle tong opening is smaller than the width of the strap, so it curls a little bit on the edges as it goes through. This will cause it to twist if you grab the buckle tong quickly and pull on it.

Canopy: The front edge of the canopy pulls easily over the edge of the carrier, but the rest of the fabric takes both hands to pull over the carrier. Kudos to Chicco for making the fabric soft and quiet and UPF 50+! Oh, and the handle swings easily over the canopy when it’s extended.


The KeyFit 35 is FAA-approved without the base. Rear-facing only carriers are very easy to install on an airplane with just a bit of practice.

I love how Chicco wrote in the manual AND on the carrier itself that the seat has a 6-year lifespan. When searching for these items, it’s very frustrating to look in the manual to be told it’s on the carseat somewhere—but then it’s not easy to find!

Chicco wants the carseat and base replaced after any crash, no matter the severity.


BravoThe KeyFit 35 will snap into any of Chicco’s strollers that accept a stroller to become a travel system. They have quite a few, from full size, to jogging strollers, to frame strollers. Check out this page; it hasn’t been updated yet to include the KF 35, but any stroller listing the KeyFit should take the KF 35.

Compatibility with other stroller brands will depend on whether that manufacturer offers a Chicco adapter, though there are many from which to choose so don’t feel discouraged.

  • No re-thread harness with 5 height positions
  • Anti-rebound bar
  • Deluxe push-on style lower LATCH connectors
  • Can be installed without base using standard or Euro-style belt path routing
  • Steel-reinforced lockoffs for simplified installation with seatbelt
  • Fits preemies and small newborns well
  • Smooth as silk harness adjuster
  • Large canopy
  • Comfy padding
  • ClearTex models are free of chemical flame-retardants
  • Instruction manual and labels are clear and easy to understand

(In fairness, these may not be a problem for everyone but I list some potential disadvantages that may be an issue for some parents.)

  • Canopy takes 2 hands to extend
  • Heavy carrier – weighs in at 10.6 lbs.

Chicco has taken a tried-and-true, well-loved rear-facing only infant seat and upped the ante by adding a no-rethread harness, an anti-rebound bar, and the option to install the carrier Euro-style when traveling without the base. The KeyFit 35 fits babies well, especially itty bitty ones, and is easy to use for new and experienced parents alike.

For more information on the KeyFit 35, visit the Chicco website.

Thank you, Chicco, for supplying the KeyFit 35 Infant Carseat used for this review. No other compensation was provided. All opinions expressed are those of CarseatBlog.

This post and others at CarseatBlog contain affiliate links. Please read About CarseatBlog for our affiliate policy and see our Marketing Disclosure.


CarseatBlog Experts Rating

Recommended: KeyFit 35


  1. Benjamin October 8, 2022
    • Heather October 8, 2022
  2. Marji Bohler April 18, 2022
    • Heather April 19, 2022
  3. Emily February 28, 2021
    • Kecia February 28, 2021

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