Doona car seat & stroller — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/doona-car-seat-stroller/  (CC BY 4.0)
Basis: Published overall sizes only: Doona (official)
Catalog version: 2026-10-20

Overall (mm): length 820, width 440, height 990
- The handlebar and frame tube diameters (what a cup holder, phone mount or hook clamps to) are not published; they come with the scan.
- The Doona is an infant car seat with fold-out wheels; the same handle is the carry handle and the stroller handlebar.
- A measured Xem scan is planned; until then this page carries only the published numbers and no geometry.
- Safety: a child car seat's harness, buckle, tongues and chest clip are crash-tested as part of the seat. NHTSA advises that aftermarket products are not recommended for use with car seats unless made or allowed by the car seat's maker, and Transport Canada reports that child-restraint makers advise that no third-party aftermarket products be used with their seats. Geometry here is for reference and for accessories that do not touch the restraint system. It is not for replacement or modified buckles, harness or chest-clip parts, and nothing should attach to or change the harness or buckle.

feature  published value  from
unfolded (W × L × H)  44 × 82 × 99 cm  Doona
folded (W × L × H)  44 × 66 × 57 cm  Doona
weight  7.8 kg  Doona
handlebar height  adjustable; not published  Doona
handlebar Ø, frame tube Ø  not published  —

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Doona (official): Doona car seat & stroller: unfolded 44 × 82 × 99 cm, folded 44 × 66 × 57 cm, 7.8 kg — web — manufacturer spec [verify license at link] — https://www.doona.com/car-seat-stroller/collections/doona-deep-blue
- NHTSA: Car seat glossary: aftermarket products are not recommended for use with car seats unless made or allowed by the car seat manufacturer — web — US government work [verify license at link] — https://www.nhtsa.gov/car-seats-and-booster-seats/car-seat-glossary
- Transport Canada: Third-party aftermarket products for children's restraint systems — web — Government of Canada [verify license at link] — https://tc.canada.ca/en/road-transportation/defects-recalls-vehicles-tires-child-car-seats/third-party-aftermarket-products-children-s-restraint-systems

Xem Studio scan: planned. Mesh $8, STEP $19, target tolerance ±0.15 mm.
API: https://xemstudio.com/api/geometry?object=doona-car-seat-stroller