2nd Seat Kit 3.0
$
175.00
Free shipping & returns for Babylist orders $45+
color
Black
1
Overview
Description
The 2nd Seat Kit allows you to expand your Mockingbird Single-to-Double Stroller (sold separately) into a double stroller.
The kit comes with a 2nd stroller seat, as well as a set of adapters to make room for two riders.
If you’re planning to stroll with one of your kids using the bassinet or car seat adapter, you’ll still need the adapters to convert to double mode, and then you can start using the 2nd stroller seat when your child develops head and neck control (typically around six months).
The seat in Mockingbird’s 2nd Seat Kit is identical to the seat included with the Single-to-Double Stroller. This means you can stroll in double mode with two kids up to 45 lbs, and you can choose to have your younger child closer to you.
It also means that the 2nd seat has all the features of the Stroller seat, including the FullShade system, which pairs the XL UPF 50+ canopy with the built-in LegShade for head-to-toe coverage sun coverage.
Other parent-favorite features include the magnetic buckle, height-adjustable canopy, reversible seasonal seat-liner, reflective piping for safer nighttime strolls and more in-seat storage.
Note: To stroll with twin infants, you’ll need the 2nd Seat Kit plus two Car Seat Adapters or two Infant Seat Inserts, as the Single-to-Double Stroller is not compatible with two Bassinets.
What we about it
Expands your Single-to-Double Stroller to double mode in under a minute, no tools required.
Details
- What’s included: Seat, Upper Adapters (to raise your 1st Seat and make room for the 2nd) and Lower Adapters (to attach the 2nd Seat)
- Max. child weight: 45 lbs in each seat
- Compatible with the Mockingbird Single-to-Double Stroller (all models)
- Cannot be used with the Mockingbird Single Stroller
- Babylist exclusive: Heather Grey
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Customer reviews
1,078 Ratings
1-10 of 1,078 Reviews
2nd kit 3.0
Love love love it!!
Jun 20, 2026
For when you need two seats on your stroller
My stroller has two seats now which is pretty helpful
Jun 20, 2026
Second seat kit
We love our mockingbird! We got the upgraded second seat kit and are so happy with it. Our little baby loves it too because it’s very comfortable. I really like that the shade extended pretty far down covering the babies from the sun when it’s really bright
Jun 19, 2026
Best stroller ever
Jun 18, 2026
Life changing
Love this kit. Life changing. We have a 2month old and 2 year old old. He loves his seat- I love the fact that if he’s asleep I can turn him the other way so get doesn’t get woken up.
Jun 17, 2026
AMAZING
Love it so much, my daughter loves it. It’s perfect. And the new seats are so awesome
Jun 14, 2026
Doing its job
I bought it for the double feature because I knew I’d have another kid and boy have we used it. We take it to the city every weekend on and off the metro, in and out of elevators. Very happy with all the functions of turning them around and comfy for lots of nap during long days.
Jun 14, 2026
We love it!
The second seat kit works great for us with two kids! It took a few tries to figure out which accessory to add first when using the bassinet or car seat adapter with the seat, since it’s so tight to have both on the stroller. But we’ve figured out a system, and it’s second nature now. We found the toddler likes to face the baby, so we love that the stroller is so customizable with kids’ orientation!
Jun 14, 2026
Love the new seat!
I love the new seat! The magnetic buckle is smooth and easy to buckle your child in. I haven’t had to wash it yet, but I like that I can remove the part my child sits on and throw it in the washer. Im excited to keep using the stroller as a double!
Jun 14, 2026
So sad
I’m so sad that this stroller came out after I bought my Changego stroller. This one is by far 100x’s better in regard to features. I wish this one was released before I bought mine. 😭 I absolutely love my Changego stroller and use it every single day but man I’m sad about this haha
Jun 12, 2026
