Despite the renaming and advertised “enhanced” features, there are still several parents and consumers out there who express their concerns and reservations regarding the Diono Radian 3RXT, 3RX and 3R.

Would you also have the same doubts about these seats? Keep reading to know if you would.

The Diono Radian 3RXT

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Vs Diono Radian 3RX

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Vs Diono Radian 3R

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ideal use






Rear-Facing Weight:

5 to 45 pounds

5 to 40 pounds

Rear-Facing Height Limit:

Up to 44 inches

Forward-Facing Weight:

20 to 65 pounds

Forward-Facing Height Limit:

57 inches

Booster Weight Requirement:

50 to 120 pounds

50 to 100 pounds

All three can be used in rear-facing, forward-facing, and booster mode.

Out of the three, 3R has the least weight limitation in rear-facing mode and booster mode while the 3RX and 3RXT share the same weight limitation.

will it fit in my car?







16.5 inches | 16 inches


28.5 inches

28.4 inches


16 inches







Do I need to use a pool noodle/rolled towel?


Easy To Install Rear-Facing?


Easy To Install Forward-Facing?


Easy To Uninstall?








Country Of Origin:


Steel Frame:


Five-Point Harness?


Side Impact Tested:


Approved For Airplane Use:


Easy To Buckle And Unbuckle?


For safety purposes, they have a fully-integrated steel frame and shell that is lined with EPS energy-absorbing foam.

These seats can be used in airplanes, yet, they can be challenging to carry unless they are placed in a bag or equipped with straps.

These Radian seats sure are easy to fold, but they are quite heavy to carry. Perhaps Diono has received such feedback because it also offers travel accessories.

If your budget allows, be ready to spend a little money on the carry strap.*

Good Convertible Car Seats Of 2023

Consider narrowing down your options by focusing on those made with EPP or EPS foam for impact management. Both materials meet government safety regulations, but EPP foam is more elastic and less brittle than EPS foam, making it better at withstanding multiple impacts and regaining its shape.

Keep in mind that any seat involved in an accident should be replaced, regardless of the foam type.

Good Convertible Car Seats With EPP Foam:

Good Convertible Car Seats With EPS Foam:

the seat






Is The Material Breathable?


Seat Weight:

28.1 lbs

26.8 lbs

23.5 lbs

Machine Washable Cover?




No-Rethread Harness?


Comes With An Infant Body Support?



Easy To Remove Cover?



10 Years

Comes With A Cup Holder?



Shoulder Harness Has Pads?


Leg Straps Has Pads?


All of them are said to offer a comfortable ride to the young passengers because they have plush premium fabric and memory foam padding.

3R is the lightest while 3RXT is the heaviest. The difference in their weight resulted from the components and features they possess.

3R has no head support and no infant cushion, so it is the lightest. 3RXT is the heaviest because of its aluminium reinforced head support.

Overall, these seats are considerably heavier than other car seats in the market. Another note regarding weight is that these seats might be trouble for anyone who plans to move them frequently from one vehicle to another.

Be sure to take your calcium supplements and have your pain relievers ready as they can be backbreakers, LOL.

All three seats also have low profile sides that can be expanded to accommodate the growing child and allow easy boarding.

The infant support cushion or infant insert that comes with 3RX and 3RXT is not present in the 3R.

They all come with 10-year expiration.

If you are only after a car seat that you can decently use for your baby, then the 3R would be a good choice. If the cup holder is a big deal for you, you should go for 3RX or 3RXT.

Nevertheless, if you are planning to use these seats in a 3-across setup, you should know that you might need to forego the cup holder because they eat up extra space necessary for the proper installation of three car seats in the back seat of a vehicle.

Therefore, 3R would be a better choice in this scenario.

most distinct Differences

Head Support With Reinforced Aluminum Tubing and With Energy-Absorbing Foam:








Only the 3RXT has head support.

At first, I would be compelled to choose 3RXT instead of 3R or 3RX because of this head support. After all, extra safety features are always welcome.

The child’s body built and height will affect if they can use the seat’s booster mode. It is quite apparent that the head support is meant for bigger or older kids, likely in booster mode.

There have been write-ups from some parents that the headrest of 3RXT often falls from its place, so the shoulder belt also goes wayward.

If this is the case, then the seat might be rendered useless for the safety of the child passenger. I might need to look for another booster seat.

More reviews also claim that the head support is challenging to manipulate. For this situation, I would once again opt instead for 3R or 3RX.

Now, if the baby is indeed within the average size range and their weight, height, and body built are within what these seats can accommodate, I will put my money on the 3RXT since it has the side impact protection features to keep my baby safe while traveling.


Just like the weight difference among three seats, their price is also commensurate to the features they offer. If you love this Diono line, but your budget is tight, then you could choose the 3R even though it lacks the infant cushion.


All three appear to be upright. The angle cannot be adjusted to make the seats more reclined.

I personally would not place a newborn infant in a seating position in these seats even with the infant cushion in 3RX and 3RXT especially if my vehicle has sloped chairs. 

The seats, for me, are not ideal for small babies because even the original features of the 3RX and 3RXT are not adequate to protect the little one.  Younger babies require every possible protection mainly in the neck and head areas.

Provided that the harness straps fit correctly on a small baby, it is still not safe for a child who cannot yet sit without assistance since the head can fall or slump.

Undoubtedly, the head support accessory from Diono “might” address the head and neck protection, but I would still consider the fact that the seats might not offer appropriate reclination for my infant child.

Every child is different. It would depend on how fast the child grows up for them to fit in these seats’ booster mode. Weight is not the only deciding factor, but also the child’s height and body structure.

For a child weighing 50 pounds and 45 inches tall, for example, the booster weight still applies. However, the child’s shoulders might already reach the head support of the 3RXT.

The child’s head might also not be accommodated in the too tight head support. For this particular concern, I think that the Radian 3R and 3RX would be a smarter option.

The Diono Radian 3R, 3RX, and 3RXT have product descriptions that are amazing with the advanced safety features and fresh design. They are also slim and appropriate for the 3-across setup. 

However, there are other more pressing matters that parents need to consider when buying these car seats.

Considering that convertible seats should ideally begin from rear-facing mode, I would want a product that has no issues in the said mode. Unfortunately, these Radian seats are not trouble-free in this regard.

Many have claimed about how challenging these seats can be installed. The possible cause for this is that the user manual might have some confusing instructions or critical errors. 

Still, there are instances when purchasing any of these seats can be done merely without special consideration.

One scenario is if I am invited to a baby shower or if I were chosen as a godmother – I could buy 3R, 3RX, or 3RXT as a gift, which I know will be much appreciated.

Check Out My Diono Radian 3RXT Review

See My Diono Radian 3RX Review

Read My Diono Radian 3R Review


What do you think?

I’d love to know your thoughts in the comments section below!




the diono radian 3rxt vs 3rx vs 3r

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  1. I have the older R100 and had no problems using it with my firstborn starting on his first birthday (we used a Chicco Keyfit30* prior to that). When this seat is used in the rear-facing mode, there is a large support included in the box that is supposed to be attached to the bottom of the seat to greatly increase the recline angle. In this configuration, the seat takes up a lot of space in front to back in the car. There is an angle adjuster accessory sold that is basically a piece of foam that props up the base of the seat to reduce the angle and thus take up less space in the car. We used this angle adjuster from day one.

    1. Hi Matthew,

      Thank you so much for sharing your inputs about the Diono Radian R100 (now Diono Radian 3R*). A lot of parents have attested that the Diono angle adjuster not just helped in the space inside the car, but also a significant help in tightening the seat down to a safe tightness.

      Kind Regards,

  2. We got in a bad accident Christmas night 2017. None of my children were injured; I had a 5 year old boy forward facing in an r-120, a 3 year old girl rear facing in an RXT, and a 1 year old boy rear facing in a Britax Roundabout, and 3 older children in seat belts, sleeping. The 1 year old was sitting next to the point of greatest impact and was only jarred awake.

    While the 5 year old boy noted that the buckle of the 5-point harness hurt his”privates”, it did not harm him, but it makes sense that in an impact, that wouldn’t feel very good. Other than that, the car seats met and exceeded my expectations.

    I will say that because of the stiffness/soreness of my older children, who had been falling asleep/asleep, I can definitely see the virtue of the rxt headwings. The only reason that I purchased a r-120 after buying an rxt was forum posts about children outgrowing the rxt wings at the shoulders. I see that not only does added support while sleeping increase comfort, but a slumped neck during an accident poses more danger. The shoulder height has not posed a problem thus far, but while I am replacing those seats, I am definitely looking at the RXT for the added neck protection of sleeping forward facing kids.

    1. Hi Heather,

      It’s amazing how car seats save children’s lives! I am glad you have properly installed them and safely buckled up your kids. Would love to know in the future any feedback with the RXT (especially in the shoulder area) as used by your growing children.

      Thanks for sharing your thoughts!

      Keep safe!


  3. Great info. I have 3 small children and these were listed as some of the narrowest seats on the market. Because I have to buy 3, I wanted to save money by opting for the R100. Now reading this, I’m sure what is best. We travel a lot and I’m concerned with head padding. I always feel bad with my 3 year old’s head falls into an awkward position. Also, have you heard any complaints about the lack of arm rests?

    1. Hi Latia,

      I haven’t read any complaints about lack of arm rests. All feedbacks are regarding the importance of the head wings. If you are concerned about your child’s head that always fall in an awkward position, then maybe you need the RXT, which has the head wings.

      But upon checking today, there is a price difference of USD 50 between the RXT and R100. That’s something to think about since you need 3.

      Have you heard about the sleep positioner? It is suitable for kids of all ages. It’s only USD 15 for two pieces. But I am not sure how well it will fit the R100. The photos shown show that it is nicely fitted in the car seat, but the convertible car seat has head wings, too.

      You might want to give it a shot and see if it works.

      I hope this helps.


  4. They all look pretty awesome actually. Not entirely sure which is the best bet. My son is a bit tall but also very skinny. I know seats go by weight, but his height can be a problem as he needs bigger seats than his body may be ready for. Which of these do you honestly prefer? I know you said it is up to us…but I am curious!

    1. Hi Marc,

      If he has a tendency to have a bigger built, I think the head wing of the RXT might “hinder” and be a cause of discomfort on his shoulder area. This is a case where R120 is your best bet.



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