- Description
- 3 STAGE REAR FACING PROTECTION
- SAFE+™ ENGINEERING
- REAR-FACING FOR LONGER
- 10 YEARS 1 CAR SEAT
- SLIM-FIT DESIGN FITS 3 ACROSS
- PRODUCT SPECS
- Reviews
- Shipping & Returns
The ultimate 3 across All-in-One car seat from birth to booster (4 – 120 lb / 1.8 – 54 kg). Featuring 3 stages of complete rear facing protection and all new Diono Safe+™ engineering to provide the next generation in car seat safety.
Features Safe+™ newborn travel high wedge, Safe+™ 2-in-1 infant positioning liner and Safe+™ steel anti-rebound bar for complete rear-facing protection.
radian® 3QX is subjected to a combination of the most rigorous crash tests to make sure we have the safest seat possible.
Designed and engineered with all new Diono Safe+™ protection. Now you can keep your child rear facing for even longer up to 50 lb (approx. 4 years old).
With 4 ways to travel from birth to booster, the radian® 3QX adapts as your child grows to offer a custom fit from birth to 120 lb.
Built with our famous radian® slim fit design, to fit 3 across in most vehicles without compromising child or passenger comfort.
Rear-facing
4-50 lbs / 1.8-22.7 kg
Forward-facing
22-65 lbs / 10-29.5 kg
Booster mode
40-120 lbs / 18-54 kg
Seated torso height
7.5-16.5″ / 19-42 cm
Overall maximum height
up to 57″ / 144.8 cm
Weight
25.8 lbs / 11.7 kg

Safe+™ newborn travel high wedge
Creates near lie-flat travel position for newborns while reducing head slump and helping to keep airways open. Simply remove as baby grows.

Safe+™ 2-in-1 infant positioning liner
Gives extra infant comfort and toddler body support. Simply remove as your toddler grows.

Safe+™ steel anti-rebound bar
One click connection to the seat base. Reduces rebound rotation by 50% in the event of a collision. Also provides more legroom when rear-facing.
Love the seat. The color we chose was B/O and Little Canadian kept me updates on ETA. Great customer service!
We love this diono car seat. It shipped super quickly and was exactly what we expected. The dionos are big car seats, which may not work well with smaller cars, but our child is super happy in it compared to her infant car seat.
Diono - Radian 3QX Convertible Car Seat
Love the quality and comfort.
Our daughter is very comfy in this car seat! Great product, fast delivery!
Little Canadian offers great shipping terms.
We offer Free 2 Day Shipping across Ontario & Quebec over $49 and Free 4 Day Shipping across rest of Canada over $49!
Under $49 shipping is only $8.99!
PO Boxes and Remote Areas (ie. Northwest Territories, Yukon) may incur extra charges which will generally is reflected at checkout.
Please note due to the gas increase due to the ongoing world conflict couriers like UPS and Canada Post are considering more cities remote than normally.
Extended 45 Day Return Policy on returnable items!
Note: Clearance Items are final sale.
Click here for further details.
Shipping time are not guranteed.
Remote area in Canada may take a few days longer.
Love the seat. The color we chose was B/O and Little Canadian kept me updates on ETA. Great customer service!
We love this diono car seat. It shipped super quickly and was exactly what we expected. The dionos are big car seats, which may not work well with smaller cars, but our child is super happy in it compared to her infant car seat.
Diono - Radian 3QX Convertible Car Seat
Love the quality and comfort.
Our daughter is very comfy in this car seat! Great product, fast delivery!
