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Nuna does not sell this seat on Amazon. See its own site for photos.

Nuna LUMN combination car seat

A harness-to-booster seat with 2 modes: forward-facing harness 30 to 65 lb, 34 to 49 in; belt-positioning booster 40 to 110 lb, 43 to 57 in.

At a glance

  • Fits children from 30 to 110 lb
  • Up to 57 in tall
  • 2 modes: forward-facing harness, belt-positioning booster
  • Seat weighs 26.2 lb
  • 18.25 in wide
  • 10-year usable life
  • Certified for aircraft use
Not sold on Amazon

Nuna lists this seat on its US site. Buy from Nuna or an authorized retailer, and confirm the exact model number before you buy.

Nuna product page (opens in a new tab) Manual (PDF, opens in a new tab)

Specifications checked against Nuna’s US site and manual on . Not hands-on tested. How I research

Who the LUMN combination car seat fits

This seat covers 2 stages, and a child has to meet every limit of the stage they are in. Nuna gives it a 10-year life from the date of manufacture, so check the date label before using a hand-me-down.

Forward-facing harness30 to 65 lb · 34 to 49 in · from 2 years
The child faces forward in the seat’s own harness. Use the top tether every time, and stay in the harness until the child outgrows it.
Belt-positioning booster40 to 110 lb · 43 to 57 in · from 4 years
The seat raises the child so the vehicle’s own lap and shoulder belt sits on the hips and across the shoulder. The child has to sit properly for the whole ride.
A school-age child with a backpack beside an empty high-back booster

What are the LUMN combination car seat weight, height and age limits?

Nuna LUMN combination car seat limits by mode
ModeChild weightChild heightMinimum ageConditions
Forward-facing harness30 to 65 lb34 to 49 in2 yearsManual: at least 2 years old
Belt-positioning booster40 to 110 lb43 to 57 in4 yearsManual: at least 4 years old

A child must meet every limit for the mode they use. The labels on your seat and its manual are the final word.

LUMN combination car seat specifications

Seat weight
26.2 lb
Width
18.25 in
Usable life
10 years
Aircraft use
Certified for aircraft (see manual for which modes)
Dimensions highest
L 26.25 × W 18.25 × H 32.5 in
Dimensions lowest
L 23.5 × W 18.25 × H 25.5 in
Recline positions
9
Headrest positions
10

How the LUMN combination car seat installs

Belt lock-off
True tension door (belt lock-off). A lock-off clamps the vehicle belt so you do not have to switch the belt's retractor into its locked mode.
Lower anchors
Push-on LATCH connectors. Check your vehicle manual for which seating positions have anchors, and switch to the seat belt once the child passes the anchor weight limit in the manual.
Recline
9 recline positions (harness and booster, when tethered). The recline angle is what keeps a young baby’s airway open, so set it before tightening the install.
Harness
No-rethread 5-point harness (stows for booster). Check the harness height at each growth spurt: at or below the shoulders rear-facing, at or above them forward-facing.

Every install is a fit between one seat and one vehicle. Read both manuals, and use a free inspection station if anything is unclear.

An empty car seat installed on a back seat, seen through an open car door

Will it fit your car?

At 18.25 in at its widest, measure your back seat before counting on three across. It weighs 26.2 lb, which matters if you will move it between cars or carry it through an airport.

  • Check your vehicle manual for lower anchor positions and any head-restraint rules.
  • Rear-facing seats need front-seat room: try the install behind the driver before you commit.
  • Certified for aircraft use, so it can travel as a seat rather than checked baggage.

What features does the LUMN combination car seat have?

  • No-rethread 5-point harness (stows for booster)
  • 9 recline positions (harness and booster, when tethered)
  • 10-position headrest
  • Push-on LATCH connectors
  • True tension door (belt lock-off)
  • All-steel frame
  • Side impact protection
  • FMVSS 213a and 213b certified (per brand)

Colors listed in the US

Caviar, Cedar, Droplet Dot, Granite.

Is the LUMN combination car seat recalled?

No campaign in the current NHTSA child-restraint data names this model family, and I have not run a separate review for it. Check your seat’s model number and date of manufacture before use.

NHTSA recall search · Recent car seat recalls

Before you buy

  1. Weigh and measure your child. The limits above are the manufacturer’s, and a child has to meet all of them for the mode they will use.
  2. Confirm the exact version. Colors, retail exclusives and model numbers change limits more often than you would expect; Nuna lists 4 colors of this seat.
  3. Read the manual before you buy, not after. It is linked above and holds the fit rules, the install methods and the expiry.
  4. Check recalls by model number and date of manufacture, and register the seat with Nuna so you hear about the next one.

Sources

Other Nuna booster seats

ModelTop child weightSeat weightWidthUsable life
LUMN combination car seat (this seat)110 lb26.2 lb18.25 in10 years
AACE booster seat120 lb15.6 lb—10 years

Other harness-to-booster seats whose published weight and height limits overlap the LUMN combination car seat.