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Top All-In-One Convertible Car Seats of 2024

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Parents who invest in their kids’ safety know it can be quite a challenge to keep up. Crossing the street? OK, look both ways and hold my hand! Climbing backwards up the slide? Maybe, uh, when you’re older. And... wait — what’s that in your mouth?! It’s truly a new surprise around every corner.

Same goes for in-vehicle safety. You can spend a great deal of time researching the perfect car seat, finding it in stock near you, making sure it fits in your car and finally purchasing it — only to discover you have to do it all over again just a few months later!

That’s because kids’ passenger safety needs change drastically as they grow. Infants require rear-facing seats to keep them safe — it is by far the safest position for your child to travel, and we highly recommend you keep them in this position for as long as possible. When your toddler reaches the maximum height or weight capacity for their infant seat, they will graduate to a convertible car seat. When they grow out of that seat, they will transition to a booster. If it sounds like a lot to keep track of...well, it can be.

All-in-one car seats to the rescue!

Like traditional convertible car seats, these seats can grow with your child. However, what makes them stand apart is that they can be used right from birth, unlike most convertible car seats that require you to use an infant car seat first. All-in-one seats also transform into a booster seat for bigger kids when needed. These savvy safety devices transition from an infant seat, to a forward-facing toddler seat, to a booster with little more than the switching of a few harnesses, clips, and cushions. How’s that for convenience?

But before springing for an all-in-one car seat, there are a few things every parent should know about ‘em:


  • “Grows” with your child
  • Fewer purchases can save you money 
  • Many designed to safely seat children up to 10 years 
  • Less waste 
  • Seriously, you only ever need one seat! 


  • Potentially higher up-front costs 
  • May be bulky and/or difficult to transfer between vehicles 
  • Few convertible car seats fit into a travel system 
  • Years of mystery stains can add up, even with washable seat cover 
  • A constant reminder they grow up too fast (sob) 

To learn more about the differences between infant car seats and all-in-ones, click here. If an all-in-one car seat sounds right for you, you’re in the right place. In this post, we’ve rounded up our favourite convertible car seats to help you decide which one is right for you.

Let’s get started!

Video Review

Maxi-Cosi Pria

YOU'LL LOVE : Easy boarding
THEY'LL LOVE : Maximum comfort

  • Rear-Facing Weight Capacity: 4–40 lbs
  • Rear-Facing Max Height: Max 40” 
  • Forward-Facing Weight Capacity: Up to 65 lbs
  • Forward-Facing Max Height: Max 49” 
  • Booster Weight Capacity: Up to 100 lbs
  • Booster Height Capacity: Max 52” 

The Pria All-in-One Convertible Car Seat from Maxi-Cosi is backed by over 30 years of European engineering for a safe ride from birth to 10 years. It features three recline positions and five headrest heights, with top-of-the-line materials for added comfort and plenty of protection. The five-point safety harness features an easy-to-use magnetic chest clip (don’t worry, it’s kid-proof), and its trademark QuickFit shoulder harness to ensure a snug fit without blackout worries.

Bonus? At $549.99, it’s one of the easiest on the wallet among our faves.

To check out our full in-depth review of the Pria All-in-One Convertible Car Seat, click here.

Peg Perego Primo Viaggio

YOU'LL LOVE : Exceptional safety
THEY'LL LOVE : The perfect fit

  • Rear-Facing Weight Capacity: 5–40 lbs
  • Rear-Facing Max Height: Max 47” 
  • Forward-Facing Weight Capacity: 22–65 lbs
  • Forward-Facing Max Height: Max 49” 
  • Booster Weight Capacity: 40 to 120 lbs
  • Booster Height Capacity: 39” to 63” 

Peg Perego’s Primo Viaggio All-In-One Convertible Car Seat puts safety first, having achieved “excellent” stability results in both the industry’s Head Injury Criterion and Head Acceleration tests.

How does it do it? With no less than a dozen headrest positions and an All-Round Protection system, it’s super easy to find your child’s safest matter the direction they’re facing.

Speaking of which: you can extend the integrated anti-rebound bar to give your little an extra two inches, helping them stay rear-facing (and safer) for a little bit longer.

To check out our full in-depth review of the Primo Viaggio All-in-One Convertible Car Seat, click here.

Britax One4Life

YOU'LL LOVE : Easy (and confident) installation
THEY'LL LOVE : Nap-friendly design

  • Rear-Facing Weight Capacity: 5–50 lbs
  • Rear-Facing Max Height: Max 49” 
  • Forward-Facing Weight Capacity: 22 to 65 lbs
  • Forward-Facing Max Height: Max 49” 
  • Booster Weight Capacity: 40 to 120 lbs
  • Booster Height Capacity: Max 63” 

U.S.-based Britax has developed what can only be described as the luxury SUV of child conveyances: the One4Life ClickTight All-In-One Car Seat. The priciest seat on our list, it sports comfort features galore: plush, sound-dampening padding; a supportive, tag-free headrest; built-in cooling channels and ventilated mesh; and even a removable head pillow. Did we mention the padded armrests?

Many adjustments can be made with just one hand, ensuring your kiddo is properly strapped in for a nap to remember. Plus, the ClickTight system ensures you’ll never have to second-guess your installation.

To check out our full in-depth review of the Britax One4Life ClickTight All-In-One Car Seat, click here.

Diono Radian 3QXT+ First Class Safe Plus

YOU'LL LOVE: Customizability
THEY'LL LOVE: Back-seat sibling rivalries (3-across)

  • Rear-Facing Weight Capacity: 4–50 lbs or 44” 
  • Forward-Facing Weight Capacity: 22 to 65 lbs or 57” 
  • Booster Weight Capacity: 40 to 120 lbs
  • Booster Height Capacity: Max 57” 

The Radian 3QXT+ First Class Safe Plus All-In-One Convertible Car Seat by Diono is a bit of a Jack- or Jill-of-all-trades. It features several seating options for every stage — including four for rear-facing newborns (one is a near lie-flat position) with further customizability through the removal and addition of protective pads as your child grows.

It also goes where you go. Its Radian slim-fit design — our narrowest seat, at 17 inches — means you can fit three car seats across most vehicles.  Travelling by air? Fold it up and use it on the plane. We also love the  exclusive premium fashion, Safe+ 2-in-1 anti-rebound panel, and adjustable calf support.

Cybex Eternis S SensorSafe

YOU'LL LOVE: Next generation technology
THEY'LL LOVE: First-class comfort


  • Use From: 5-110 lbs 
  • Rear-Face: 5 to 50 lbs or 17-48" tall
  • Forward-Face to: 22-65 lbs or 28-49" tall
  • Booster: 40-110 lbs or 44-57" tall
  • Highest Harness Height: 48” 

The Eternis S SensorSafe All-in-One Convertible Car Seat by Cybex is a versatile and safety-focused solution for families with growing children. It is a highly innovative car seat that can be adjusted to your child's needs as they grow, allowing for use in rear-facing, forward-facing, and booster seat configurations. This makes it a long-lasting and reliable choice from infancy to toddlerhood.  

One of the key features of this car seat is its SensorSafe technology, which ensures your child's safety during every ride. The technology sends real-time alerts to your smartphone, giving you peace of mind and ensuring your child's well-being.  

In addition, the car seat also has advanced side-impact protection, energy-absorbing materials, and an adjustable headrest and harness, offering superior protection and comfort. Its stylish design and easy installation further enhance the overall experience.  

The Eternis S SensorSafe Car Seat is a dependable and convenient choice for parents, offering peace of mind and adaptability as your child grows. 

For more information, please check out our full in-depth review, here.

Diono Radian 3 RXT Safe+ All-In-One

YOU'LL LOVE: Anti-rebound protection
THEY'LL LOVE: Grow-with-me comfort features


  • Use From: 4 to120 lbs 
  • Rear-Face to: 4-50 lbs 
  • Forward-Face to: 22-65 lbs 
  • Booster: 40-120 lbs 

The Radian 3 RXT Safe+ All-In-One Convertible Car Seat by Diono is a smart solution for families seeking safety, versatility, and longevity in one package. This seat is your one and done option accommodating infants, toddlers, and even older children. We love you can keep your little one rear-facing up to 50 lbs (the safest position for your kiddo) and that you can use it as a booster up to 120 lbs.

From baby's first car ride home to they reach double digits, this seat will keep your child comfortable and secure. The Safe+ technology offers additional protection to your child by incorporating a steel frame and a reinforced headrest, while the memory foam cushioning and adjustable harness ensure a comfortable ride.

For more information, please check out our full in-depth review, here.

One & Done

Which all-in-one car seat is right for your family?

No matter which seat you pick, you can count on first-class safety features to keep your little one safe and sound. These one-and-done seats are designed to be your little one’s travel companion from birth until they hit the double digits — talk about value for money!

As you continue your search, don’t forget to consider the little things. Do you want a cup holder? Do you want the fabric to be removable and machine washable? Do you need to fit two or more other seats in a row?

Good luck and happy shopping!