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Mockingbird 2nd Seat Kit 3.0 - Black.Mockingbird 2nd Seat Kit 3.0 - Black.Mockingbird 2nd Seat Kit 3.0 - Black.Mockingbird 2nd Seat Kit 3.0 - Black.Mockingbird 2nd Seat Kit 3.0 - Black.Mockingbird 2nd Seat Kit 3.0 - Black.Mockingbird 2nd Seat Kit 3.0 - Black.
Mockingbird 2nd Seat Kit 3.0 - Black.

2nd Seat Kit 3.0

Rated 4.6 out of 5
1,103 Reviews|, Answered Questionsor
$
175.00
Free shipping & returns for Babylist orders $45+
color
Black
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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

1,103 Ratings
4.6out of 5
1,103 Ratings

Rated 5 stars by 80% of reviewers

Rated 4 stars by 10% of reviewers

Rated 3 stars by 4% of reviewers

Rated 2 stars by 3% of reviewers

Rated 1 star by 3% of reviewers

1-10 of 1,103 Reviews
Rated 5 out of 5
Seat Kit 3.0
I LOOOVEEEE the new upgrade. The extended shade my baby gets and the leg shade cover too! I am waiting to upgrade my second 2.0 seat to the 3.0 seat and can’t wait to buy the second one! I also love the new black finish i stead of the silver.
Sep 3, 2026
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Rated 5 out of 5
Easy & Convenient
I love that we don’t need to buy a whole new stroller, and that there are accessories and kits that include EVERYTHING you need. No confusing manuals, no confusing parts. Great buy. Highly recommend.
Sep 3, 2026
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Rated 5 out of 5
So easy!!
I was worried going from the single to the double set up would be a little complicated but it is so simple and also easy to go back to the single set up if needed. Highly recommend!!
Sep 2, 2026
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Rated 5 out of 5
2nd seat
I love my mockingbird!!! Great for my two children
Aug 31, 2026
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Rated 2 out of 5
Not as nice as the old one
I bought a second seat for my second baby and the buckle system absolutely sucks to use, especially with a squirming baby. The magnetic flap on the sunshade doesn’t reach the opposite magnet so it doesn’t stay open. I do like the extra pocket and how the seat is an insert you can easily take out to wash and the sunshade is also easier to disconnect to wash. However, I may hesitate to buy another seat if the buckle situation doesn’t change. First seat I bought in 2023- great! Second seat I bought in 2025- meh/frustrating.
Aug 24, 2026
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Rated 5 out of 5
Love!
This stroller and the 2nd seat attachment have been a huge lifesaver with my twins. It is so easy to switch between the seats or the car seat attachment.
Aug 21, 2026
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Rated 5 out of 5
Second seat kit
Best stroller I’ve ever had, I love that it is so easy to put on and take apart, my three year old can climb into her seat alone. Obsessed with the newer neutral colors they offer since I have my daughter and newborn son in the stroller.
Aug 19, 2026
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Rated 5 out of 5
Love it
Absolutely love this stroller and the upgraded seat, I recommend to everyone
Aug 8, 2026
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Rated 5 out of 5
Great seat
I love how modular and easy to take on and off. A very well designed seat
Aug 5, 2026
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Rated 5 out of 5
2nd Seat
Very happy with our purchase of the 2nd seat. Very easy to install or take back apart as needed!!
Aug 5, 2026
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