2nd Seat Kit 3.0
$
175.00
Free shipping & returns for Babylist orders $45+
color
Rose
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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Q&A
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Customer reviews
1,096 Ratings
1-10 of 1,096 Reviews
Love it
Absolutely love this stroller and the upgraded seat, I recommend to everyone
Aug 8, 2026
2nd Seat
Very happy with our purchase of the 2nd seat. Very easy to install or take back apart as needed!!
Aug 5, 2026
Great seat
I love how modular and easy to take on and off. A very well designed seat
Aug 5, 2026
East to buckle & unbuckle straps, amazing shade, easy setup, & easy recliner
Aug 4, 2026
Cover does great with shade . I don’t like the magnet seat buckle 2.0 seat seams to be holding on better . Overall… I think I should have just bought a wagon .. stroller is very hard to navigate with two kids when passing a driveway
Aug 3, 2026
Great!
Just as expected
Jul 31, 2026
Amazing Upgrades!
I ordered the second seat after having my mockingbird stroller for over two years. I hadn't really looked at the changes because I needed the seat regardless. It fit seamlessly onto my older version stroller, and I was amazed when I opened up the canopy. The canopy comes down sooo much farther than the original and covers my newborn so much better. Additionally, the strap are so much more easily adjustable and the snaps are so much easier to use! And the padding on the seat itself looks so much…
Jul 29, 2026
Easy installation
We loved how easy it was to add an additional seat to our stroller. Also the many configurations there is for both seats
Jul 26, 2026
Use with Twins
We have been using this stroller since our twin boys were born. We bought the bassinet and 2nd seat kit. We are very thankful for this stroller however we wish it was easier to get stuff out of the bottom compartment when in use .
Jul 25, 2026
Second seat kit
Love the upgrades to the seat. It looks sharp. After having pushed the kids around the zoo as a double stroller I will say it’s quite hard to navigate. My toddler is 30 pounds plus a newborn. If you are going straight it’s a bit heavy but fine, but very difficult to turn. I had to physically pick it up and redirect to do sharper turns. I think this would be true of all front/back double strollers but just something to be aware of.
Jul 24, 2026
