
Cosco Kids
Scenera Next DLX Convertible Car Seat
Super light, cheap, great for air travel, but outgrown fast.

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Get a bassinet for the 4-6 months as baby will likely be sleeping next to your bed. Any crib would be fine tbh, I wouldn't recommend a mini crib (we thought babies are small, want do they need that space for). We end moving our kid to a floor bed at 10 months. We did a newborn seat (rear facing) then upgrade to a convertible at 10 months (big baby). Having a newborn seat that is compatible with your stroller is really handy. The stroller was the most important part, my kid is 3 and we still haul it out for trips with lots of walking. We are also in a very walkable area, so your milliage may vary. We got the Uppababy Cruz +Mesa car seat. If you are close to a retail store, definitely go try out a few brands. I'd suggest a convertible seat that is easy to disassemble and wash. We got the Diono Radian 3RXT and it's work to clean.
Uppababy Mesa but the new V3 which is a redesign of the previous Mesa. I understand the seat holds them better/more comfortably than the V2.
Uppababy Mesa V3 car seat fits. We just graduated to the Nuna Rava. It fits too. When going into the seat, watch baby’s head with the Nuna rava. I have it backward facing and reclined to position 1 and still have to be careful. But once little one is seated, clearance is good.
We are getting the Uppababy Cruz 3 stroller with the Mesa V3 seat and adding a bassinet attachment as we go on frequent walks. I like how sturdy it is for our cracked/brick city sidewalks, and we get snow and ice so we like the wheels on it. Goes up to thirty pounds for the car seat and can be installed without a base if need be. I was a little uncertain as it’s pretty pricey system but we already got the bassinet and seat purchased for us from our registry, so it will definitely be it!
I have the mesa v3 and love it for its looks, easy install (latch system) and adjustability, but for some reason it forces my newborn into a hunching over position that doesn't seem comfortable, and has her chin almost always touching her chest. I scheduled a consultation with their carseat representative and while helpful, its seems it's just built that way :/ My husband and i have found that stuffing a burp cloth behind her back helps make her more comfortable. I kinda wish we went a different route ( i was eye-ing joie + nuna) but we found the vista for a good price on marketplace, so we figured we'd buy the mesa (purchased new of course) as well. Congratulations and good luck!
You can gate check a stroller and a car seat (you can also use the car seat on the airplane if she has her own seat.) you can check these items for free. When our babies were that age, we just took our car seat (the uppababy mesa without the base) onto the plane, used it with the rental car, and gate checked a smaller travel stroller. Traveling with a baby can seem overwhelming but it’s really pretty simple if you just take a breath and think about it. Buying a Doona for this would be overkill. Your normal car seat probably would work? Idk why you’d need to buy a new one

Cosco Kids
Scenera Next DLX Convertible Car Seat
Super light, cheap, great for air travel, but outgrown fast.

Cosco Kids
Scenera Next Convertible Car Seat
Portable, affordable, quickly outgrown, airplane buckle discomfort.

Joie
Mint Latch
Easy baseless LATCH install, lightweight, but quickly outgrown.

Nuna
PIPA Series
High-end travel, easy baseless install, but very pricey.

WAYB
Pico™ Portable Car Seat
Ultra-light, compact travel, quick install, but expensive and outgrown fast.

Ranked #1
Cosco Kids - Scenera Next DLX Convertible Car Seat

Ranked #1
Cosco Kids - Scenera Next Convertible Car Seat

Ranked #1
Cosco Kids - Scenera Next DLX Convertible Car Seat

Ranked #1
Doona - Doona Series

Ranked #1
Cosco Kids - Scenera Next Convertible Car Seat

Ranked #1
Nuna - PIPA Series