Pick how you're putting it in. Each way is from the maker's manual.
Base with LATCH
Where it can go: Rear-facing only, on forward-facing vehicle seats. Never on a front seat with an active airbag; the back seat is safest. Rear center with lower anchors only if the vehicle maker approves that position and the anchors are no more than 22 in. apart; otherwise use the seat belt there or pick an outboard seat.
1Park on level ground and set the base on the vehicle seat with the adjustment foot toward the seat back.
2Press the level adjust button to extend the foot until only green (no red) shows on the angle indicators on both sides.
3Push the orange buttons and pull both lower anchor connectors out of their storage pockets.
4Clip the connectors onto the vehicle lower anchors in the seat crease, facing upright.
5Press the base firmly down into the seat crease so the webbing retracts and tightens, until the tightness indicator turns green and stays green.
Check it before you drive
Base moves no more than 1 in. side-to-side or front-to-back at the belt path.
Lower anchor webbing is secure and untwisted.
Tightness indicator is green every time you use it; if not, push the base into the seat crease again.
Level indicator shows only green between the arrows, no red.
Retold from UPPAbaby manual (PDF). Your vehicle's manual also says which seats have LATCH anchors. When in doubt, a certified child passenger safety technician can check your install.
The carrier on and off the base
Clicking it onto the base
1Lower the carrier onto the installed base until you hear a click.
2Pull up on the carry handle to check the carrier is locked on.
3Before driving, lock the carry handle in the 4th (rebound) position.
The maker warns: The carry handle must be locked in the 4th (rebound) position whenever the seat is used in the vehicle.
The Mesa V2 base: Base with lower anchor connectors or vehicle belt lock-off, tightness indicator, adjustment foot.
What UPPAbaby says about its bases and carriers, for a second car or an older base.
A Mesa V3 carrier clicks into the original Mesa base and the Mesa V2 base, so an older spare base still works with the newer seat. UPPAbaby help article
The newborn insert
What UPPAbaby says about the insert
1Use the included infant insert for smaller babies; it is recommended from 4 to 11 lbs.
2You can keep using it past 11 lbs until your baby meets every fit check below without it.
3Harness straps sit at or slightly below the shoulders, and the chest clip is at armpit level.
4The crotch buckle rests snugly against your baby with no gap, and your baby is not sitting on it.
5There is room to tighten the harness properly and your baby is not slouching.
6Once all checks are met without the insert, you can remove it.
The maker warns: Harness pads are optional but must be removed when securing a preemie. Never use add-on products with this seat unless UPPAbaby has approved them.
Rear-facing only, on forward-facing vehicle seats. Never on a front seat with an active airbag; the back seat is safest. Rear center with lower anchors only if the vehicle maker approves that position and the anchors are no more than 22 in. apart; otherwise use the seat belt there or pick an outboard seat.
How do I know the UPPAbaby Mesa V2 is installed right?+
Base moves no more than 1 in. side-to-side or front-to-back at the belt path. Lower anchor webbing is secure and untwisted. Tightness indicator is green every time you use it; if not, push the base into the seat crease again. Level indicator shows only green between the arrows, no red.
When do I use or remove the UPPAbaby Mesa V2 infant insert?+
Use the included infant insert for smaller babies; it is recommended from 4 to 11 lbs. You can keep using it past 11 lbs until your baby meets every fit check below without it.
