# Single\-to\-Double Strollers That Add a Second Seat Later Which single\-to\-double strollers can be converted to take a second child later? Bugaboo Kangaroo Seat Complete Stroller: It is a single\-to\-double stroller sold in a seat\-only version so you can start with one child and adapt later\. It converts to a tandem stroller by adding a Bugaboo sibling seat, which is sold separately\. It is for toddlers from 6 months to about 4 years, with a maximum seat capacity of 50 lbs \(22 kg\)\. Cybex Gazelle S 2: Converts from single to double without adapters\. Integrated seat adapters tuck into the frame, and the top adapters shift up for a second seat or to bring the shopping basket close\. Bugaboo Kangaroo Complete Stroller \+ Bassinet Bundle: An all\-terrain single\-to\-double stroller that can be used as a newborn stroller and expanded for two or three children\. Seat holds up to 50 lbs / 22 kg\. Cybex Gazelle S: Owners highlight that no adapters are needed to switch to double mode and that the second seat matches the first seat's weight limit, unlike some rival rumble seats\. Praised for offering around 20 configurations with built\-in adapters, which makes switching between setups much easier for parents, and called a strong option for twins\. Bugaboo Donkey 6 Complete Single\-to\-Double Stroller \+ Essential Accessories Bundle: A reviewer who tested the conversion in store found it works exactly as claimed: three clips, press a button, slide to expand the frame by 14 cm, no tools and under a minute; the expanded frame felt solid with no flex or wobble\. In double mode the stroller is 29\.1 inches wide and the listing says it still fits through standard doorways\. ### 1. [Bugaboo Kangaroo Seat Complete Stroller](/products/ucp/albeebaby-com/9468511977703) (sold by albeebaby\.com) It is a single\-to\-double stroller sold in a seat\-only version so you can start with one child and adapt later\. - Conversion: It converts to a tandem stroller by adding a Bugaboo sibling seat, which is sold separately\. (listing) - Seat limit: It is for toddlers from 6 months to about 4 years, with a maximum seat capacity of 50 lbs \(22 kg\)\. (listing) - Double width: - ### 2. [Cybex Gazelle S 2](/products/ucp/albeebaby-com/9681282269415) (sold by albeebaby\.com) Converts from single to double without adapters\. - Conversion: Converts from single to double without adapters\. (blog) - Seat limit: - - Double width: - ### 3. [Bugaboo Kangaroo Complete Stroller \+ Bassinet Bundle](/products/ucp/albeebaby-com/9468851749095) (sold by albeebaby\.com) An all\-terrain single\-to\-double stroller that can be used as a newborn stroller and expanded for two or three children\. - Conversion: An all\-terrain single\-to\-double stroller that can be used as a newborn stroller and expanded for two or three children\. (listing) - Seat limit: Seat holds up to 50 lbs / 22 kg\. (listing) - Double width: - ### 4. [Cybex Gazelle S](/products/ucp/albeebaby-com/9616947478759) (sold by albeebaby\.com) Owners highlight that no adapters are needed to switch to double mode and that the second seat matches the first seat's weight limit, unlike some rival rumble seats\. - Conversion: Owners highlight that no adapters are needed to switch to double mode and that the second seat matches the first seat's weight limit, unlike some rival rumble seats\. (review) - Seat limit: The user guide's configuration chart lists maximum child weights up to 22 kg \(about 50 lbs\)\. (manual) - Double width: - ### 5. [Bugaboo Donkey 6 Complete Single\-to\-Double Stroller \+ Essential Accessories Bundle](/products/ucp/albeebaby-com/9574995165415) (sold by albeebaby\.com) A reviewer who tested the conversion in store found it works exactly as claimed: three clips, press a button, slide to expand the frame by 14 cm, no tools and under a minute; the expanded frame felt solid with no flex or wobble\. - Conversion: A reviewer who tested the conversion in store found it works exactly as claimed: three clips, press a button, slide to expand the frame by 14 cm, no tools and under a minute; the expanded frame felt solid with no flex or wobble\. (review) - Seat limit: - - Double width: In double mode the stroller is 29\.1 inches wide and the listing says it still fits through standard doorways\. (listing) ## Also cited in the text - Cybex Gazelle S 2, integrated adapters: Integrated seat adapters tuck into the frame, and the top adapters shift up for a second seat or to bring the shopping basket close\. (review) - Cybex Gazelle S, configurations and adapters: Praised for offering around 20 configurations with built\-in adapters, which makes switching between setups much easier for parents, and called a strong option for twins\. (blog) - Bugaboo Kangaroo Seat Complete Stroller, What it is: It is a single\-to\-double stroller sold in a seat\-only version so you can start with one child and adapt later\. (listing) 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 2026-10-09T20:09:02.498Z. 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. - [What RoboTrunk is](/agent/story.md) - [Every tool, in your browser through WebMCP](/agent) - [The tools and how to call them](/agent/tools.json) - [The stores you can buy from](/agent/merchants) - [Every store's products](/products/ucp) - [Search every store at once](/products/search)