Finally Revealed the Best Car Seats for 3 Across in 2021

Best Car Seat For 3 Across

“He’s not breathing! Get to the hospital right now!”

These are some scary words.

And this can happen if you pick the wrong car seat. More on this a bit later.

You’re looking for the best seat to use for 3 across. Maybe you have a smaller car or have a bigger family, and you need more space. I might be able to help you with that.


I know that the market is saturated with all kinds of car seats. It takes weeks on end just to find a normal one. It’s even longer if you’re looking for 3 across.

This is the reason why I’ve created the Best Car Seats For 3 Across article. By reading this, you will be able to save a lot of time. I’ve picked the very best, so there will be only a handful to look through. You’re not wasting weeks on end on this.

By the end, you will know which car seat is the right fit for you.

I won’t leave you hanging. I will share with you everything there is to know about the breath issues. This wasn’t just a clickbait title. Also, I will reveal which car seat was involved and what did it do.

Let’s get this best article started.

#1 Diono Radian 3RXT Convertible Car Seat – Best Car Seat For 3 Across

Diono Radian 3RXT All-in-One Best Car Seat For 3 AcrossWidth: 17 inches wide

This incident happened with a friend of mine. Father and son were on their daily commute. The little one was in the back, staying quiet. Everything was the same old, same old until they crossed a faithful intersection.

Another driver ran the red light. The impact was unavoidable. Their van got hit from the side. The collision happened on the same side where the child was sitting. The metal bent and the glass shattered. The bang was loud and scary. The front of their car was absolutely destroyed.

The airbags protected the father, and the Diono kept the boy safe. The father had a few bruises while his son didn’t even have a scratch on him.

The Diono Radian 3RXT won the Best Car Seat For 3 Across award for many reasons. First of all, it’s safe. The little guy wasn’t hurt in the accident.

Also, it’s an all in one car seat, which is the narrowest you can find. The width is just 17”. If you want to do 3 across, then it will be easy to do. You get great mileage because it can be used up to 120 pounds.

At first glimpse, this car seat is huge, but looks are deceiving. It has a bonus feature. These convertible seats are foldable so you can easily take it with you on the plane. There are many color combinations, so your little one will fall in love with it. It’s one of the best convertible seats you can get. This car seat is not only the best for 3 across, but it’s also the best Diono car seat overall.


Finally, a car seat where the baby isn’t slouching or sliding down

It’s lightweight and easy to move around

It’s soft and padded plus it comes with side impact protection


The gray fabric is not that stain friendly

You can’t remove the fabric; the only solution is spot cleaning.

#2 Clek Liing – Best Infant Car Seat For 3 Across

Clek Liing Best Infant Car Seat For 3 AcrossWidth: 16.9 inches wide

When you need every inch of space in the car seat, then the Clek family is here to the rescue. Clek is known for many things, mostly its eco-friendly cover. But this time they have outdone themselves with this infant carrier.

It’s the narrowest one on the market, and it’s only 16.9 inches wide. When you have to do 3 across or need space for an adult, this car seat is the right choice for you.

Besides being a space saver, it’s one of the safest car seats you can get. They are the highest rated on consumer reports. Now Clek is not cheap; you need a budget if you want to get these infant car seats.

As I mentioned above, they use all-natural materials for the cover. Their secret is merino wool. Best about the cover is that there are no harmful substances or toxic flame retardants. So it’s perfectly safe for kids with sensitive skin.

The installation is super easy with these infant seats, thanks to the rigid latch system. Within a few seconds, you will be able to get a secure connection. This will happen all the time, no guesswork required. Plus, this infant carrier can be installed both with or without the base.

When you have no space to spare, then the Clek Liing infant seat will help fit into a tight situation.


It’s one of the safest infant seats you can buy

The fabric is chemical-free so ideal for sensitive skin babies

The load leg is a lifesaver it reduces the rebound energy by 40%


It’s the most expensive infant seat that you can buy

The infant cushion has rubber safety labels that get hot and sticky

#3 Clek Foonf – Best Convertible For 3 Across

Clek Foonf Convertible Car SeatWidth: 16.9 inches wide

This incident happened with a friend of mine. They were driving on a slow Sunday morning. Their daughter was quiet in the back. When all of a sudden, there was a big crash, and the windshield exploded into deadly shards.

The father instinctively slammed the break. The airbags deployed protecting the adults.

A tire flew into the car. There weren’t any injuries. When things quieted down, they checked on their daughter. She was scared and unhurt. There wasn’t even a scratch on her.

The Clek Foonf protected the little girl from the rapid deceleration. Now at first glimpse, this car seat looks like a tank. Well, it’s built like it, and it’s one of the slimmest convertible car seats that you can find. The width is only 16.9 inches.

This convertible car seat caters to infants up to 65 pounds. It can be installed both front and rear-facing. If you want to do extended rear-facing, you will be able to do it up to 50 pounds or around the 4th birthday.

It has all the protection that your little one needs. Plus, it’s comfortable because it has enough recline so they can sleep without the floppy head syndrome.

Clek is known for its great cover. It’s free from any chemicals or toxic flame retardants. It’s an ideal car seat for kids with sensitive skin.

The looks are deceiving with this car seat. You can do 3 across with ease. The Clek family is known for having a narrow profile.


It’s built like, and tank and it’s elevated so kids can lookout

This car seat will allow you to keep your child rear-facing as long as possible

It has installation videos which will help you secure your car seat


The seat cover can’t be removed, so spot cleaning is the only option

Leveling is done through leveling lines which is difficult to get it right

#4 Chicco Myfit Zip Air Booster Seat – Best Harness Booster Car Seat For 3 Across

Chicco MyFit Harness + Booster Car SeatWidth: 17 inches wide

“He’s not breathing! Get to the hospital right now!”

No parents should hear these words ever. And yet it was all too common with some friends of mine. You see, their boy had breathing difficulties. If something blocked his air pathways, they ended up in the ER.

The latest trigger was a bad car seat. As kids get older, most car seats offer less and less recline. Eventually, when the child falls asleep, his head will flop. This happened with my friends. So they went on a quest to find the perfect car seat o cure this problem.

The solution came with the Chicco Myfit Zip Air Booster Seat. It has sufficient recline, and they didn’t end up in the hospital ever since. Besides being a comfortable car seat, it has a narrow profile.

That big thing? No way! Yes, that was my reaction as well. This car seat has only a 17” width, so 3 across can be done. If you’re at this stage, then this will be the last car seat that you will ever have to buy.

It has two modes harness and booster mode. The upper weight limit is set to 100 pounds. You will be getting a lot of mileage out this car seat.

The Chicco Myfit Zip Air is comfortable, safe, and has a narrow profile. You can do 3 across with ease with it.


It’s a heavy-duty car seat that won’t move no matter what

Your child will sleep easily without the dreaded head slump

It’s well-cushioned, and it won’t overheat


It has a narrow profile so thinner kids will be the most comfortable

Padding behind the belt not removable for washing

#5 Graco Milestone – Best 3 In 1 Car Seat For 3 Across

Graco Milestone 3 in 1 Convertible Car SeatWidth: 16.2 inches wide

This happened with our neighbors. They were driving through some country roads on the weekend. Their sun was snoozing in the back. All of a sudden, a huge deer appeared in the middle of the road.

There wasn’t enough time to think. The only thing that the father managed to do is hit the brakes. He could’ve tried avoiding the dear, but then things would’ve got worse. Maybe the car would’ve rolled over who knows.

Instead, they hit the dear head-on. The engine got most of the beating. Of course, the airbags deployed instantly. The car got totaled instantly. There were no injuries. The 3-year-old boy was safe and sound.

The Graco Milestone it’s unique. The width of the car seat is jutted 16.2” which means it’s the slimmest 3 in one car seat that you can get. It has even managed to beat Clek. By being this narrow, you will be able to do 3 across with ease.

Besides being narrow, it’s a great 3 in 1 car seat. As you have seen, the protection has been tested in a real crash, and it was flawless. It caters to infants all the way up to 100 pounds. So you’re getting a lot of mileage out of this car seat.

It’s cool and comfortable. With that narrow width, it’s the best choice for 3 across.


Easy to get baby in and out and it’s easy to move between cars

Great dark colors so dirt isn’t visible

It’s so safe it has probably designed by a mom


There’s no good harness holder you will waste time strapping in

If you have large hands, it will be difficult to loosen the straps

#6 Graco Tranzitions – Best Budget Car Seat For 3 Across

Graco Tranzitions 3 in 1 Harness Booster SeatWidth: 17.4 inches wide

This incident happened with a friend of mine. She was driving her daughter home from ballet class. Everything was the routine.

Then they stopped at a red light. A drunk driver slammed into them from behind. To make things worse, the crash happened at 50 mph.

The impact was loud. The trunk pure and simply evaporated. The back seat has bent into an unnatural angle.

The mother is fearing the worst checked on her daughter. She was fine. There wasn’t a scratch on her. She was shaken up. Otherwise,e she was OK.

When you’re on a budget, or you want a secondary narrow car seat, the Graco Tranzitions is a great car seat to have. As you’ve seen above, this affordable car seat saved the life of a little girl.

It’s the cheapest 3 in 1 car seat that you can get. It has a slim design. The width is just 17.4” wide. For an affordable car seat, you’re getting your money’s worth. It caters to toddlers who are at least 22 pounds all the way up to 100 pounds.

This Tranzitions car seat could be the last one you will ever buy.

If you can spare less than a half-inch, then this car seat will be a great 3 across the seat.


Finally, a super lightweight car seat that’s easy to transition in and out

It has a narrow profile so three car seat can be fitted in the back

The cushion gives extra comfort, so it’s good on long road trips


The armrest feels short you can only utilize them in backless booster mode

It’s not the prettiest car seat around it gives a cheap feeling

Buyer’s Guide

Hell of a trip, wasn’t it? I thought about what would be a great compliment for this article. Then it popped into my mind that a buyer’s guide would be a great bonus. Maybe in the future, you would be able to put it to use.

Parents literally spend weeks, if not months sorting through all the car seats. By having this go-to guide, you can eliminate those car seats that are not interesting and only spend time with those that might be a good fit.

Before we can get to that, there are a few things I have to mention.

Once you get the car seat, you have to decide where you want to mount it. The safest place is in the middle of the car. Yes, I’ve heard this over and over again. That’s impossible. OK, no problem, I have another place which is the second safest one. It’s located behind the driver.

Getting the right install is crucial. If not, then the car seat won’t be able to give the maximum potential. According to a recent study, 75% of car seats in the US are installed poorly. That’s troublesome. So many kids are riding around without the necessary protection?

This is why you should reach out to a licensed professional if you have any doubts. I’ve just noticed that Amazon is offering it as a service for a fee. So now you have no reason not to have a safe install.

It’s time to get this buyer’s guide started.


This is the #1 item on my list. This is where all begins. Car seats exist to keep kids safe. Currently, on the market, there are only safe car seats. If there are issues, they are recalled immediately.

To get on the marketplace, the seats have to pass the government tests. The good news is that all of them pass. The bad news is that there are a few brands that barely cut while others over-deliver. Now, which one would you like to protect your child?

My best advice here is to get the safest one that you can afford. The best one is the one that offers both side impact protection and rollover. Though there are only a few that offer these two.

Side impact protection comes in different layers. The most common one is between 1 and 3.

Size Limits

This is my favorite place to save money. Yes, there’s a secret, and I will share it with you in a minute. Let’s face it. These car seats are expensive. Plus, they have a short expiration date. Not to mention that are outgrown way too fast, so that’s money out of your pocket.

The secret to saving money is to plan ahead. If you buy the car seat for a longer period, you will be saving money. Also, this is why all in one car seats are so popular nowadays. You buy it once and will serve your child until they don’t need the car seat anymore.

Here you should check the weight. If you have to swap it between cars, it’s good to know if they are heavy or not.


This is the biggest issue with car seats to get the right install. To make it fair, all brands stride to make the install as easy as possible.

Even so, there are so many car seats poorly installed. No matter what read the manual, that’s why it’s included. If something is not clear, then check out YouTube, you can probably find a better installation video.


This the last point on my list. We all know how kids are. They leave a mess and tend to have accidents. Now from all the car seats above, the Clek family is not machine washable. They only allow spot cleaning and you have to buy things from them.

This is the end of my buyer’s guide.


We have reached the end of the best car seats for 3 across article. It was a long journey. By now you should know which car seat is the right fit for you.

It’s your move now get the right one as soon as possible because the last time I’ve checked, the stocks were running low.

I would love to hear from you. Maybe you have some experience with different car seats then share them below.

Frequently Asked Questions (FAQ):

Which car seats are perfect for fit three car seats across?

All of the above car seats are good for fitting three across. Depending on the age and weight you can choose which one of them is the best fit to do seats fit 3 across. Which car seats convertible seats fit 3 across? The Diono Radian would be the winner.

Which car seat didn’t make it on the list?

The Chicco Keyfit barely missed a position.

Which booster seats can do three car seats across?

The narrow seats can do this. Since they are boosters seats you can use rear facing mode. Rear facing mode is for the convertible car seats for small cars. These are all safe car seats. You can use the seat belt or the vehicle seat belts to make the right install.

What safety features can you expect from boosters seats that can do three seats?

Maybe you have a new car or a bigger family and you need great 3 car seats across.  Don’t forget the cup holders. The latch connectors will work until booster mode after that you have to use the seat belts.

Which car seats (booster seats) would be a good alternative for the list above?

These car seats / booster seats would be good alternatives: clek oobr booster seats, primo viaggio infant seat, maxi cosi mico max 30 infant seats, immi go belt-positioning booster seat. The mico max 30 infant car seats are a great choice for middle seat and rear seat.

Can you fit 3 infant car seats across?

Yes you can fit 3 infant car seats across if you pick one from the above list. The infant seat doesn’t really allow a lot of wiggle room. As you know infant seats come with an infant insert. The weight ranges for a new car seat is between 4 and 35 pounds.

Can you fit 3 booster seats across?

Yes there are multiple booster seats that allow to fit 3 across. The list above can help you. The drawback of these seats that bigger kids might not have sufficient hip room, shoulder room, leg room. You get the best weight range with these car seat types.

How is the car safety ratings with these car seats?

I know how important are car safety ratings. This is why I have only picked seats that have high car safety ratings. The car seat manufacturers go out of their way to offer the most protection possible. These child seats go through serious crash tests. And only those are allowed to be sold which have high crash test ratings. As you know crash forces are vicious during an accident. This is why you need the best protection possible. If you need a car seat guide then reach out to a local child passenger safety technician and check with local car seat laws. Typically these car seats are meant to be installed on the back seats. This can be done with the seat belt or the latch anchors. As you know the seat belt installation is the slowest. Also there are the tether anchors for added protection and child restraints. The harness straps are padded so your kids don’t get hurt during powerful crash forces. Most infant seats can be installed without the base. The seat without base install can only be done with the seat belt. Other features to check out would be: seat belt buckles, base width, bucket seats, recline adjustment, cup holder.

How can I fit 3 across car seats in most cars?

There’s some science to fitting 3 across car seats in most cars. It’s incredibly easy in a larger vehicle while while it’s challenging in small cars. In midsize suvs there will be very little room between the front seat and the one row. What we have done is we moved the oldest child to to front seat plus we still have third row access. Two convertible seats fit nicely side by side only the middle seats will be crammed especially with smaller vehicles. This is why you should check out narrow car seats some even have rear facing seating positions. If you have very little room in your midsize SUV then consider the highback booster with latch installation for extra space. Most kids will be comfortable in the front seat where you won’t need the narrowest seats.

What is the most need to know info about 3 across car seats in most cars?

The most need to know info about 3 across car seats in most cars is as follows. Always consult with child passenger safety technicians if you’re not sure about the mounting. For center seating position it’s a good idea to check a bucket seat. Always check the latch weight limit even with platinum models. If there’s a load leg use it because it’s a life saver. Other features to take into count: lower latch anchors, rigid latch, harnessed seats, head restraints (head restraint), lower anchors, forward facing bucket seat and forward facing convertible seat. Plus there are other seats to choose from (other car seats) for the back seat.

How to choose new car seats for young children?

The bad news is that most seats work with most cars and most kids. If you have a smaller car then you will need a narrow car seat. Also you can choose from backless booster seat, forward facing bucket seat, convertible seat or even a highback booster with lower anchors. Some seats are a bit heavier which might be because of extra safety. These seats work in seats work and in one row.

Last Updated on October 18, 2021