Best Narrow Car Seats 

Small cars and multiple children do not have to be mutually exclusive. Anyone that has ever sat in a car next to a child knows that car seats take up a lot of room.

know that narrow car seats take up a lot of room. check narrow seat

This is annoying for adults and children when they have to sit next to a smaller child in a car seat. But, it becomes downright impossible if you have to squeeze more than one child into the same row of seats, whether to fit them in a midsized sedan because you don’t have or don’t want a minivan or into a larger car because there are many children that need a car seat.

Fortunately, there are a lot of options available for you when it comes to the booster seat. If you check the list of the best small booster seats from Amazon in the article, you will find a brief product description of each booster with all its essential features that will give you an idea of what might fit your needs. Once done, you can continue reading to see  FAQs on the narrowest booster seat and the top and best booster car seat brands that we chose based on multiple factors such as price and safety.

Narrow Car Seats


Diono Everett NXT - (See Customer Reviews & Pricing)


  • The Everett NXT promises 8 years of use which makes it a good investment for your growing child. It comes in different colors at a reasonable price.
  • It has a slim-fit design without compromising safety and comfort. This slender seat is also very lightweight and can be easily transferred from one vehicle to another.


Chicco KidFit 2-in-1 Belt-Positioning Booster Car Seat - (See Customer Reviews & Pricing)


  • The KidFit features a reliable safety-proof design that offers head and shoulder side-impact protection and 10 position adjustment to accommodate your child as they get older.
  • This car seat also comes with ErgoBoost double foam padding and 2 space-saving cup holders.


Graco Tranzitions 3 in 1 Harness Booster Seat - (See Customer Reviews & Pricing)


  • The Tranzition booster seat has a forward-facing design and it can hold up to 22- 100 lbs. It is light to carry and can be easily converted from a harness booster to a backless booster.
  • This small car seat has a Simply Safe Adjust Harness System and adjustable headrest to 8 height positions.


Britax Skyline Booster Car Seat - (See Customer Reviews & Pricing)


  • The Britax Skyline Booster Seat is converted from highback to backless. This slender seat stylish 2-stage belt-positioning booster features a quick-adjust headrest to let your child use it until he or she reaches 63 inches and 120 pounds.

It does not have to be that way if you choose your seats carefully. A well-chosen car seat can make what feels like a jigsaw puzzle destined to fail into an easy process that keeps everybody safe and comfortable.

The easiest way to improve the multiple seats in a row situation, or even to just make a backseat more comfortable for people who sit next to them, is to invest in slender booster seats.

There are many seats out there that prioritize a small width that doesn’t sacrifice anything in safety, which is most important, of course.

In addition to their narrow width, some of the best seats even improve safety and had added benefits that promote the longevity of the seat and children’s comfort while sitting in it.

We will focus on slender booster seats specifically to help you sort through the options, so you know if a high back booster, a backless booster, or a 2-in-1 booster is the best for you.

In general, the narrowest option tends to be a backless booster, but while your child still needs to be in a high back version, there are options. When choosing the best and narrowest booster seats, there are a few different factors to keep in mind.


Narrow Seat Width

When you’re looking for a small booster seat, the first thing you’ll probably think to check is the seat’s width, and you’re right to do so. A typical booster seat width is between 17 and 25 inches wide, so opting for boosters that fall approximately between 15 and 20 inches will guarantee that you’ve chosen one of the narrowest options out there.

This measurement is usually taken at the widest point on the base of a backless booster, but if you’re dealing with boosters that have a high back, double-check to make sure that no area on the back is wider than the widest point on the base, including in the headrests.



When a booster seat boasts that it is a 2-in-1 seat or it is convertible, that usually means that as your child grows the seat will transition with them from a booster with a high back to a backless booster. Not all boosters do this, but many have this capability, which makes the booster seat last much longer.

That said, sometimes the 2-in-1 seats are not always the narrowest because they have extra parts built in to complement both kinds of seats. A convertible car seat is great because you can have a booster car seat and an infant seat all at your disposal. Plus, convertible seats can be changed once the child gets older.  You can even turn a convertible seat from a car seat for a child to a booster seat.

There are slender booster seat options too that come out of convertible seats, so consider this, since you can get a slender booster seat that fits easily in the car from a convertible option.

Plus, a convertible seat usually fits most cars, and you can change it from a car seat for a small kid to a seat for an older kid without too much issue.

When looking for a car seat, consider a convertible car one, so you’re saving money and can fit it in most cars.  A convertible seat also can be used for up to 100 pounds in most cases, and when you use a convertible seat, you can adjust the car seat to fit older children, which is pretty great too.

Armrest Placement

The narrowest boosters often omit armrests or incorporate thin, flexible armrests to save space. This can sometimes be beneficial because one of the biggest safety mistakes that people make with a booster seat is buckling the child in with the seat belt over the top of the armrests, so the belt rests on their stomach, instead of along the child’s lap. As such, sometimes these narrow boosters without armrests can actually be safer for children because they promote correct buckling.

Some of these might not have cup holders on them, because if you add cup holders to a small booster seat, it adds width. Usually, with a small booster seat, or an infant car seat they are on the side, so if you want to use them, you simply put them down. most booster seats have armrests that are easy to put down, and with a booster seat, you can still have room after adding three of them to your car.


Seat Buckle Accessibility

If you’re trying to cram three boosters into one row of a car, then almost inevitably at least one of the boosters will cover up when you need to buckle the child. Although you can purchase extensions to help with this problem, one great way to avoid it altogether is to invest in a booster seat that has some sort of built-in access to the buckle, usually in the form of a hole to access it.

Usually, it’s easy to use a seat belt with a car seat, but some struggle if the car seat, or if the booster car seat is large.  With a rear-facing car seat, usually, you don’t have to buckle it each time, which can help some parents, since an infant seat just involves a 3 point harness and buckling it.

But, one thing to consider, especially with a booster car seat, since with a booster car seat, you’re having them buckle it themselves, is where the seat belt sits.  Rear-facing isn’t as much of an issue, nor is it with an infant car seat and a toddler seat. But once you start looking at booster car options, you should look at where the seat belt will fit.

One way to check to see if your car seat or booster car seat will fit is to measure your car.  Usually, a booster seat fits three in a row so you can take the total width and divide it by three. That way, you can look for booster car seats that size or smaller. A small booster seat usually can be around the size, or a bit smaller.

Some booster seat options might need a bit more room to buckle, and if you notice that your booster seat is a struggle to get the seat belt into, you might want to consider a car seat that is a little easier

Choosing one of those boosters can maximize the amount of space you have, so you don’t have to fumble around seats to get your children buckled and even make it so children learn how to buckle themselves quicker.

Child Comfort With Narrow Car Seat

Your child might end up sending a lot of time in their booster seat, so, although safety is your top priority, you’ll also likely want to choose a booster seat they will be comfortable in. Some come with additional padding to ensure maximum comfort, and while a booster seat might not seem like the most comfortable seat in the world, they actually can be very comfortable. Some slender booster seat options are not the best for long journeys.  If you can, maybe take your child to the store and try some of these booster seats and see if they like them.  From there, you can trim down the car seat that you should consider and choose the booster option that works best.

With a slender booster seat, you should look at the best seats on the market, and then look to the amazon reviews. That way, you can see whether the seats on the market will work for your child and what parents have to say about it.  Some may say the high back boosters aren’t as comfy, some might say that it’s good.  You might want to look at the specifications as well on this high back booster seat since it will tell you whether or not it gives the child enough room.

Some high back booster seats are comfy, while other high back booster seats aren’t good for long journeys.  Some are 4 inches wide or more, which means that this high back booster will work for the long journey, but if the material is less, it might be a bit cumbersome. Overall, you should try these out, and consider the car seat options you can get.

Talk to your child about which kind of car seat they’ve liked the most in the past, and they might be able to give you some clues about what you can buy in the future.

Our Favorite Narrow Booster Seats

With all of these important factors in mind, it comes time to choose a small booster seat. Here are some of our favorite small booster seats:

Maxi-Cosi Rodifix Booster Seat: this booster seat is one of those with a high back. It’s very slim but also promotes comfort, correct buckling technique, and easy buckling. The only downside of this is that it can’t convert to a backless booster.


Peg Perego Viaggio Shuttle Plus 120

Of all the booster seats out there, this one is one of the most impressive because of its flexible sides that allow you to adjust the width of the seat based on a child’s needs. That flexibility allows it to accommodate children of all sizes, and the back can also be removed. This is convertible and works well for a small car.  It does come with side-impact capabilities, and it is a high back booster seat that fits pretty well, even in cars with three seats. This convertible car seat can be a backless booster and the cover is removable and machine washable. For those with small cars, it might be the best option, since it does come with the safety that you want from a booster seat.

Diono Radian 3RX Convertible Car Seat

Diono radian also has a booster car seat, and it’s one of the best seats on the market.  This is a slender booster seat that offers room to grow, and it can be used for both rear-facing, and as a high back booster seat.  It is a pretty sizable high back booster seat that can give children room to grow, up to 120 pounds, and while it does have reinforced walls of 4 inches wide, it is also thick in order to withstand the pressure of crashes. Diono Radian does create high back booster seats that will help keep your child safe, and with a high back booster seat, they will be up there and protected. A booster car seat that is convertible is great, and you’ll get that and so much more with the Diono Radian brand.


Maxi Cosi Convertible Car Seat

Finally, you have Maxi Cosi, which can convert from an infant car seat to a booster car seat. It is a high back booster that can hold children of a sizable weight, and since it is 4 inches wide, it offers a lot of protection.

Because it is 4 inches wide to start, it is a high-quality high back booster seat that will give your child ample protection.  It is a bit on the pricey side for a high back booster, but if you want one of the best high back booster seat options on the market, this is the best.


Graco RightGuide Portable Seat Belt Trainer

This booster seat is the narrowest of all. At a very affordable price, this backless booster is a great option for older kids that still need boosters.

The Graco TurboBooster

The Graco Turbobooster is another backless booster seat to; consider, and that’s because it is considered one of the best booster seats on the market.  It is mostly a booster car seat for children up to 100 pounds and 57 inches, and it is a good small seat option, and one of the best seat protections out there.

Unlike some other backless booster seat options, this one does come with the side impact protection that you need, and it is one of the best seats on the market if you’re looking for a backless booster seat for older children. This is the best seat because it is one of the most slender seats on the market, and it comes with cup holders your child can use.  This booster seat is also easy to use with a standard shoulder belt, and it is one of the most comfortable booster seats for a small car.


Frequently Asked Questions On The Best Narrow Car Seat Booster

Which booster seat is the narrowest?

The narrowest booster seat out there currently is the Graco RightGuide Portable Seat Belt Trainer. This narrowest car seat clocks in at 13.25 inches at its widest point and is also very affordable. It is a backless booster seat.

What is the narrowest booster with a high back?

If your child is not quite ready for a backless booster, then the Diono Radian 3R All-in-One Convertible Car Seat is one of the best car seat options.  At just 16 inches across, this car seat high back is still remarkably slim and can work for your child as they grow. This backless booster seat offers the option of being able to fit three seats in a car, and it is one of the best seats on the market for a child, and it is a good booster seat for those parents who need something for older kids that isn’t super huge.  It does have an option to use the seat belt in the car, and it fits perfectly.


Can you put three seats in a row?

Yes, you can put three in a row. This tends to work best when at least one and preferably two or all three of the seats are booster seats. In order to squeeze them all in, you’ll need to ensure that you choose those that are ideally made to be placed next to others. It can be a challenge to fit three but if you choose three similar slender car seat options or even a booster car seat with infant seats on the side, this can definitely work.  There are also infant car seat choices out there too, and if you have them rear-facing, you can make this work, and it can fit all the seat belt options too.

Some people struggle with a booster seat in a small car, but usually, you can fit three if you have them as boosters.


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Last Updated on October 5, 2021 by Jacqui Arnaiz

DISCLAIMER (IMPORTANT): This information (including all text, images, audio, or other formats on is not intended to be a substitute for informed professional advice, diagnosis, endorsement or treatment. You should not take any action or avoid taking action without consulting a qualified professional.   Always seek the advice of your physician or other qualified health provider with any questions about medical conditions. Do not disregard professional medical advice or delay seeking advice or treatment because of something you have read here a

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