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Graco SlimFit 3 in 1 Convertible Car Seat

Review Last Updated: 26th March 2020
Product Review by Sophie
Product Features
  • Integrated harness storage compartment
  • 3-in-1 convertable seat
  • Graco ProtectPlus engineered


The Graco SlimFit 3 in 1 Convertible Car Seat is, in our opinion, one of the best convertible car seats available anywhere, and may well be the perfect choice for you.

The 3-in-1 car seat has one simple task – to adapt as your child grows and ensure that they remain safe, secure, and comfortable along the way.

Safety is, of course, the number one factor when choosing a car seat for your little one, and the Graco Milestone has all of the safety features you need to have confidence that your child is safe on the road.

This, coupled with the stylish design, comfort, maintainability, and value-for-money all make it an excellent choice for any busy parent.

In this post, we’re going to review the features, pro’s and cons, and overall functionality of the Graco SlimFit 3 in 1 Convertible Car Seat, giving you all of the information you need to make that ever-important, fully-informed decision on which car seat is best for you and your little one.

Let’s dive straight in…


  • 4-position recline
  • A number of headrest positions
  • Removable cup holder


  • Users reported tendencies for seat to move around when secured

Graco SlimFit 3 in 1 Convertible Car Seat Product Review

The Graco SlimFit 3 in 1 Convertible Car Seat has tons of features that’ll not only make your life easier as a parent but also give you peace of mind when it comes to taking your child out and about on the road.

There is a lot to cover in this review and so I’ve broken it down into key phases – this way, you’ll spend less time reading about things that aren’t at the top of your priority list, and more time focusing on what’s important to you and your little one.

In this review we’re going to cover:

  1. Road Safety
  2. Technical Specifications (limits and dimensions)
  3. Practicality and Use
  4. Comfort and Design
  5. Value for Money

Graco Milestone: Road Safety

Road safety is probably the most important factor any parent will have to consider when deciding which car seat is best for them and their little one.

With the Graco SlimFit 3 in 1 Convertible Car Seat, safety comes first.

This car seat provides safety and security for your child in frontal, side, rear, and rollover crashes, and has been tested by inhouse ProtectPlus procedures, which are in line with guidelines set out by The Federal Motor Vehicle Safety Standard (FMVSS).

With the 5-point harness, the Graco Milestone all-in-one Car Seat is also FAA approved.

It is recommended by experts that you keep your child in a rear-facing position for as long as possible, so it’s great that the Graco SlimFit 3 in 1 Convertible Car Seat allows you to do this until your child is 40 Ibs; meaning that you can keep your child facing until the age of around 4-5 years old (providing they’re under the 40 Ibs limit).

The Simply Safe Adjust Harness System allows you to adjust the headrest and harness in one motion; ensuring a proper (safe) fit.

Ensuring your child is safe and secure throughout the entire journey is every parent’s number one priority and with the Graco SlimFit 3 in 1 Convertible Car Seat, these features help you achieve your goal.

Graco Milestone: Technical Specifications (Limits and Dimensions)

The Graco Milestone offers significantly more to parents and their children, over and above the 3-in-1 nature of the car seat.

With a weight of just 19.8 Ibs, the Graco SlimFit 3 in 1 Convertible Car Seat is lighter than some of the alternatives, including the 4Ever 4-in-1 Convertible Car Seat also manufactured by Graco.

The Slimfit 3-in-1 car seat is also less bulky than its 4Ever 4-in-1 counterpart, with dimensions of just 19.7″ x 16.2″ x 25.5″.

I’ve broken down the Graco Milestone all-in-one car seat limits and dimensions for you below, so you have a better overview:

  • Weight: 19.8 Ibs
  • Dimensions: 19.7″ x 16.2″ x 25.5″

Graco Slimfit: Shell and Seat Dimensions

  • Height of Shell: 21″
  • Seat Depth: 12″
  • Seat Width: 19″
  • Crotch Strap Positions:
    • Without Infant Insert: 4″, 5.5″, and 7″
    • With Infant Insert: 3″, 4.5″, and 5.75″

Graco Slimfit: Rear-Facing with Harness

  • Weight Limit: 5-40 Ibs
  • Height Limit: Head must be at least 1″ below the red handle

Graco Slimfit: Forward-Facing with Harness

  • Weight Limit: 22-65 Ibs
  • Height Limit: 49″ (max)

Graco Slimfit: Booster

  • Weight Limit: 30-100 Ibs
  • Height Limit: 38″-57″

Graco Slimfit: Practicality and Use

It’s not easy for parents on the move and that’s why the Graco SlimFit 3 in 1 Convertible Car Seat is so great for active, on-the-go families; day-to-day parental activities are pretty effortless.

This may sound like a trivial point, but lugging car seats in and out of the car all day is hard work – that’s why you need a lightweight option that is versatile and as mobile as possible.

The Graco SlimFit 3 in 1 Convertible Car Seat is extremely easy to install, cleaning and maintaining it is a dream, and its pretty lightweight in comparison to some of its competitors.

All of these points make this car seat the ideal choice for busy parents and families on the move.

The 4-position recline helps ensure a secure installation, with prominent ‘click’ sounds along the way to give you the confidence you need to begin each journey and Graco’s push-button InRight LATCH provides an easy, one-second attachment (again with an audible ‘click’ for increased confidence).

With a 5-point harness and the integrated harness storage come as standard with the Graco Slimfit 3-in-1; helping you keep the harness stored away and safely secured.

There are a number of other, really useful practical features with the Graco Milestone that will make your job of parenting that bit easier, including:

  • Machine washable cushion
  • Metal and plastic parts; cleanable with mild soap and water
  • Easy-to-clean buckles; using just a damp cloth
  • Easy-to-clean harness straps; spot cleaning advised

Graco Slimfit: Comfort and Design

The Graco Slimfit doesn’t just provide your little one with a safe environment in which to travel, it also offers real comfort for those long journeys, boasting a 4-position recline.

As your little one grows, so does the Graco all-in-one (hence the name), ensuring that your child remains comfortable throughout their early years and beyond.

As far as car seats go, the Graco Milestone also offers a compact, trendy design, and genuine mobility and convenience.

If your child’s comfort is on the top of your priorities when selecting a car seat, the Graco Milestone is the ideal choice for you.

Graco Slimfit: Value for Money

The first point to note here is that the Graco SlimFit 3 in 1 Convertible Car Seat is the more affordable option when compared to its Graco counterpart, the 4Ever 4-in-1 Convertible Car Seat.

The Slimfit 3-in-1 Car Seat offers excellent value-for-money; taking your child from 5 lbs to 100 Ibs.

The fact that this car seat doesn’t convert into a backless booster is one of its only downsides, but this can easily be offset when calculating the minimal cost of purchasing a separate booster when the time comes, and comparing that cost against the cost of a 4-in-1 car seat which does convert into one, such as the 4Ever Convertible Car Seat.

One thing is for certain – you will get years, and years worth of use out of the Graco Milestone car seat and buying an all-in-one initially will more than likely save you money in the long-run.

One way of looking at the cost of the Graco Slimfit is taking the cost and breaking it down over 8-10 years. That’ll give you a good indication of how far your money really is stretching with this long-lasting car seat.


With flexibility and long-lasting durability, comfort and a compact design, and outstanding value-for-money, there really aren’t many downsides to the Graco SlimFit 3 in 1 Convertible Car Seat.

More importantly, there are a number of safety features that make this car seat an obvious choice for those safety-conscious parents.

With its all-in-one functionality, this car seat will last you years (literally), and that can’t be understated – particularly as your family grows. Having to buy a new car seat every couple of years is the last thing any busy family needs.

The Graco Slimfit is easy to maintain and cleaning is a breeze; something every busy parent will appreciate.

Over and above everything else, this product provides you with peace of mind that your little one will remain comfortable, secure, and most importantly, safe as they travel – something that, for most parents, is priceless.

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