Today, April 10th, Nuna officially launched a car seat that might change the way we think about booster seats entirely — meet the LUMN, Nuna’s very first harness-to-booster seat. What? you might say... If you have a preschooler or kindergartner creeping up on 40 pounds and suddenly looking enormous in their convertible seat, this may be the thing you didn’t even know you were waiting for — a transitional seat between your convertible and booster seat stages. 

So what is the LUMN?

Technically speaking, it’s a forward-facing car seat that starts off in harness mode (like a traditional convertible car seat with a 5-point harness) and then transitions into a belt-positioning booster once your child outgrows the harness. Think of it as your child’s bridge between “little kid” and “big kid” seat. And yes, it’s designed to last a long time, for up to 10 years.

Why this matters right now

There’s a quiet shift happening in the car seat world — and it’s one we’ve written about before (updated federal safety regulations which are expected later this year), likely increasing the importance of extended harness use and rethinking how booster readiness is evaluated. The LUMN is arriving with perfect timing — built to ride that wave of change with both longevity and serious safety cred.

Standout features we love

While it follows Nuna’s sleek and safety-first design ethos, the Lumn introduces some thoughtful upgrades we haven’t seen in regular booster-seat category before:

• Bubble-free recline positions
• Adjustable calf support
• Dual pop-out cup holders that tuck away elegantly
  
• Elbow rests
• And ofcourse, a no-rethread 5-point harness that tucks away when they graduate to booster mode

Add in machine-washable inserts, airline approval (in harness mode), and a headrest that adjusts to 10 different positions, and you’ve got a seat that genuinely grows with your kid — not just in height and weight, but in attitude (3 sleek colorways available) and gradual independence.

Usage-wise, harness mode covers 30–65 lbs and 34–49”, and booster mode ranges from 40–110 lbs and 43–57”. It’s a generous, flexible range — and more importantly, it meets both current and anticipated regulatory standards.

A broader shift in the industry

In many ways, LUMN marks a whole new chapter in the car seat world. As more brands focus on extended harness use, smarter transitions, and reducing the number of seats parents have to buy (or re-install), we expect to see more innovation like this. Nuna has always played the long game when it comes to function and form — and this is a perfect example.

One last thing

At $650 retail, the LUMN is undeniably premium (especially in a year where tariffs and price increases are hitting almost all baby gear categories) but for families looking to invest in a single booster seat — one that bridges the in-between stage when your child has outgrown their convertible but isn’t quite ready for a backless or belt-only booster — this just might hit the sweet spot between form, function, and extra peace of mind.

The Lumn is now available at Tadpole.