Stroller parts that add a second seat

Which stroller parts can add a second seat or convert a stroller into a double?

Mockingbird Single-to-Double Stroller Seat 2.0: The product is the Single-to-Double Stroller Seat 2.0 by Mockingbird, a replacement part. The Stroller Seat is compatible with all Mockingbird Single-to-Double Strollers and 2nd Seat Kits, including 2023 and earlier models; for a Single Stroller replacement, contact Mockingbird Product Specialists. Mockingbird Replacement 2nd Seat Kit Adapters Set: Converting the stroller to a double is described as moving the first seat up with the upper adapters and then attaching the second seat with the lower adapters. The second seat kit does not fit the older single Mockingbird stroller: the bar holding the basket under the seat sits where the second seat adapter needs to clip on.

ProductWhyFitIncludedConversion stepsManual
1. Mockingbird Single-to-Double Stroller Seat 2.0 sold by hellomockingbird.comThe product is the Single-to-Double Stroller Seat 2.0 by Mockingbird, a replacement part.The Stroller Seat is compatible with all Mockingbird Single-to-Double Strollers and 2nd Seat Kits, including 2023 and earlier models; for a Single Stroller replacement, contact Mockingbird Product Specialists. guideThe replacement includes a Stroller Seat only; the Canopy and Child Bar are available separately. guide-A 2nd Seat Kit Instruction Manual is available as a download. manual
2. Mockingbird Replacement 2nd Seat Kit Adapters Set sold by hellomockingbird.comConverting the stroller to a double is described as moving the first seat up with the upper adapters and then attaching the second seat with the lower adapters.The second seat kit does not fit the older single Mockingbird stroller: the bar holding the basket under the seat sits where the second seat adapter needs to clip on. blogThe item is a set of replacement upper and lower adapters for the adapters included with a Mockingbird 2nd Seat Kit. listingConverting the stroller to a double is described as moving the first seat up with the upper adapters and then attaching the second seat with the lower adapters. blogMockingbird's help centre hosts the 2nd Seat Kit instruction manual as a downloadable PDF. manual

Also cited in the text

Every value in the table is a fact RoboTrunk checked, linked to the page it came from. A dash means no checked fact fills that cell. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live.

Written 2026-10-15T13:56:43.552Z.

This page is published by RoboTrunk, a store built for shopping agents.

The store named on this page sells the product and ships it. RoboTrunk is not
the seller and never holds the money.

Buying works in one path. RoboTrunk's tools prepare a checkout at that store,
then hand back a short-lived link. The person approves the total; once RoboTrunk
has checked the store's total against it, the person is given the checkout link to
tap in their own browser, or, if the person prefers and gives permission, their
agent may open the link and finish there, and payment always happens on the
store's own checkout page. RoboTrunk never takes the payment or sees a card.

Where the rest of this site is:

- /agent/story.md is what RoboTrunk is and how it works, in full.
- /agent/tools.json is every tool, its arguments and its answers.
- /agent/merchants is every store you can buy from through RoboTrunk.
- /products/ucp is every store's indexed products.
- /products/search is one search across every store, in plain words.