{
  "schema_version": "compare-page.v2",
  "page_id": "sibling-seats-for-adding-a-second-child-to-a-stroller",
  "url": "https://robotrunk.com/compare/want/sibling-seats-for-adding-a-second-child-to-a-stroller",
  "title": "Sibling seats for adding a second child to a stroller",
  "question": "Which sibling seat can be added to a stroller so that a second child can ride along?",
  "answer": "Bugaboo Donkey 6 Sibling Seat: The sibling seat turns a Bugaboo Donkey 6 into a side-by-side double stroller for a second child. Bugaboo Donkey 6 Sibling Seat certification: The Bugaboo Donkey 6 is certified to ASTM F833 (latest version), ASTM F2050 (latest version) and by the Juvenile Products Manufacturing Association (JPMA).\nThule Sleek 2 Sibling Seat: Thule Sleek 2 Sibling Seat in Black converts a Thule Sleek 2 stroller into a sibling stroller. Thule Sleek 2 Sibling Seat safety standard: Manual lists ASTM F833-21.\nBugaboo Kangaroo Sibling Seat: It is made for the Bugaboo Kangaroo stroller and adds a second seat for tandem use. Bugaboo Kangaroo Sibling Seat age and weight: The store recommends it from 6 months, with a maximum child weight of 40 lb (18 kg); it is not for newborns.\nCybex Gazelle S Seat Unit: The second seat converts the Gazelle S from a single to a double stroller so two children can ride at once. Cybex Gazelle S Seat Unit fit: No additional adapters are needed to convert the stroller to a double.",
  "kind": "stroller accessory",
  "market": "US",
  "generated_at": "2026-10-11T15:22:45.593Z",
  "columns": [
    "Safety standard",
    "Age and weight",
    "Warranty",
    "Dimensions"
  ],
  "notices": {
    "facts": "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.",
    "price": "Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live."
  },
  "cited_facts": [
    {
      "ref": "p1.f1",
      "product": "Thule Sleek 2 Sibling Seat",
      "field": "What it is",
      "value": "Thule Sleek 2 Sibling Seat in Black converts a Thule Sleek 2 stroller into a sibling stroller.",
      "stated_as": "Easily turn your Thule Sleek 2 into a comfortable sibling stroller—just add the Thule Sleek 2 sibling seat, and both kids are ready to ride.",
      "source_type": "listing",
      "source_url": "https://dd1dfe-a3.myshopify.com/products.json",
      "source_read_at": "2026-10-10T19:03:37.915Z"
    },
    {
      "ref": "p1.f8",
      "product": "Thule Sleek 2 Sibling Seat",
      "field": "Safety standard",
      "value": "Manual lists ASTM F833-21.",
      "stated_as": "ASTM F833-21",
      "source_type": "manual",
      "source_url": "https://www.thule.com/-/s/approved/std.lang.all/33/69/1623369.pdf?rev=1.2",
      "source_read_at": "2026-10-11T06:40:53.258Z"
    },
    {
      "ref": "p1.f11",
      "product": "Thule Sleek 2 Sibling Seat",
      "field": "Dimensions",
      "value": "Dimensions are 32.7 x 17.1 x 43.5 inches.",
      "stated_as": "Dimensions (L x W x H): 32.7 x 17.1 x 43.5 in",
      "source_type": "listing",
      "source_url": "https://dd1dfe-a3.myshopify.com/products.json",
      "source_read_at": "2026-10-10T19:03:37.915Z"
    },
    {
      "ref": "p2.f1",
      "product": "Bugaboo Kangaroo Sibling Seat",
      "field": "Age and capacity",
      "value": "The store recommends it from 6 months, with a maximum child weight of 40 lb (18 kg); it is not for newborns.",
      "stated_as": "No, it is suitable for toddlers from 6 months up to 40 lbs (18 kg).",
      "source_type": "guide",
      "source_url": "https://anb-baby.myshopify.com/products/bugaboo-kangaroo-sibling-seat-black-midnight-black-midnight-black",
      "source_read_at": "2026-09-24T15:02:48.356Z"
    },
    {
      "ref": "p2.f2",
      "product": "Bugaboo Kangaroo Sibling Seat",
      "field": "Purpose and compatibility",
      "value": "It is made for the Bugaboo Kangaroo stroller and adds a second seat for tandem use.",
      "stated_as": "Add a second seat in just a few clicks and keep strolling with the Bugaboo Kangaroo you already know and love.",
      "source_type": "guide",
      "source_url": "https://www.bugaboo.com/us-en/kangaroo-seat-accessories/bugaboo-kangaroo-sibling-seat-black-moon-grey-moon-grey-100281023.html",
      "source_read_at": "2026-09-24T15:02:50.805Z"
    },
    {
      "ref": "p2.f4",
      "product": "Bugaboo Kangaroo Sibling Seat",
      "field": "Warranty",
      "value": "The authorized retailer states that a full manufacturer warranty applies, but provides no duration or terms.",
      "stated_as": "Full Manufacturer Warranty",
      "source_type": "guide",
      "source_url": "https://anb-baby.myshopify.com/products/bugaboo-kangaroo-sibling-seat-black-midnight-black-midnight-black",
      "source_read_at": "2026-09-24T15:02:48.356Z"
    },
    {
      "ref": "p2.f5",
      "product": "Bugaboo Kangaroo Sibling Seat",
      "field": "Seat dimensions",
      "value": "The seat measures 17.7 inches (45 cm) long by 11.8 inches (30 cm) wide.",
      "stated_as": "Seat length 17.7 inches (45 cm)\nSeat width 11.8 inches (30 cm)",
      "source_type": "guide",
      "source_url": "https://www.bugaboo.com/us-en/kangaroo-seat-accessories/bugaboo-kangaroo-sibling-seat-black-moon-grey-moon-grey-100281023.html",
      "source_read_at": "2026-09-24T15:02:50.805Z"
    },
    {
      "ref": "p3.f1",
      "product": "Bugaboo Donkey 6 Sibling Seat",
      "field": "function",
      "value": "The sibling seat turns a Bugaboo Donkey 6 into a side-by-side double stroller for a second child.",
      "stated_as": "Converts the Bugaboo Donkey 6 into a side-by-side stroller for a second child",
      "source_type": "listing",
      "source_url": "https://dd1dfe-a3.myshopify.com/products.json",
      "source_read_at": "2026-10-08T19:02:14.639Z"
    },
    {
      "ref": "p3.f3",
      "product": "Bugaboo Donkey 6 Sibling Seat",
      "field": "safety certifications",
      "value": "The Bugaboo Donkey 6 is certified to ASTM F833 (latest version), ASTM F2050 (latest version) and by the Juvenile Products Manufacturing Association (JPMA).",
      "stated_as": "The Bugaboo Donkey 6 is certified by:\n     - ASTM F833 (latest version), ASTM F2050 (latest version) and the\n     Juvenile Products Manufacturing Association (JPMA).",
      "source_type": "manual",
      "source_url": "https://www.bugaboo.com/on/demandware.static/-/Library-Sites-BugabooSharedLibrary/default/dwdce7f736/PDFs/User%20guides/Online%20UG%20Donkey%206%20NA.pdf",
      "source_read_at": "2026-10-09T06:56:39.535Z"
    },
    {
      "ref": "p3.f6",
      "product": "Bugaboo Donkey 6 Sibling Seat",
      "field": "age and weight limit",
      "value": "The store listing says the sibling seat is for children from 6 months up to 22 kg (50 lbs), while the Donkey 6 North American manual says the seat maximum is 23 kg (50 lbs); the sources disagree on the kilogram limit.",
      "stated_as": "For toddlers from 6 months to 22 kg (50 lbs)",
      "source_type": "listing",
      "source_url": "https://dd1dfe-a3.myshopify.com/products.json",
      "source_read_at": "2026-10-08T19:02:14.639Z"
    },
    {
      "ref": "p3.f12",
      "product": "Bugaboo Donkey 6 Sibling Seat",
      "field": "dimensions",
      "value": "Sitting space at the widest point with the footrest is 19.7 in long x 14.5 in wide x 17.3 in deep.",
      "stated_as": "Sitting Space (widest point with footrest): 19.7\" L x 14.5\" W x 17.3\" D",
      "source_type": "listing",
      "source_url": "https://dd1dfe-a3.myshopify.com/products.json",
      "source_read_at": "2026-10-08T19:02:14.639Z"
    },
    {
      "ref": "p7.f1",
      "product": "Cybex Gazelle S Seat Unit",
      "field": "conversion",
      "value": "The second seat converts the Gazelle S from a single to a double stroller so two children can ride at once.",
      "stated_as": "convert the Gazelle S from a single to a double stroller with a second full size seat to allow two children to ride at the same time.",
      "source_type": "listing",
      "source_url": "https://dd1dfe-a3.myshopify.com/products.json",
      "source_read_at": "2026-10-08T19:02:14.639Z"
    },
    {
      "ref": "p7.f5",
      "product": "Cybex Gazelle S Seat Unit",
      "field": "weight limits",
      "value": "The US manual prints configuration limits of 35 lbs/15.9 kg and 50 lbs/22.7 kg; the global manual prints 15 kg and 22 kg, so the regional figures disagree.",
      "stated_as": "max. 35 lbs/15,9 kg   max. 50 lbs/22,7 kg",
      "source_type": "manual",
      "source_url": "https://shop.cybex-online.com/on/demandware.static/-/Sites-cybex-master-catalog/default/dwbe058d1e/pdfs/manuals/ST_GO_Gazelle_S_Seat_Unit_US/CY_171_6841_B0720_Gazelle_S_Seat_Unit_US_UG.pdf",
      "source_read_at": "2026-10-09T18:18:13.324Z"
    },
    {
      "ref": "p7.f8",
      "product": "Cybex Gazelle S Seat Unit",
      "field": "warranty",
      "value": "Open-box purchases include a 1-year manufacturer's warranty and are final sale, not eligible for return or exchange.",
      "stated_as": "Open-box purchases include a 1-year manufacturer’s warranty. Please note, these items are final sale and not eligible for return or exchange.",
      "source_type": "guide",
      "source_url": "https://dd1dfe-a3.myshopify.com/products/cybex-open-box-gazelle-s-second-seat-almond-beige",
      "source_read_at": "2026-10-09T18:18:00.693Z"
    },
    {
      "ref": "p7.f12",
      "product": "Cybex Gazelle S Seat Unit",
      "field": "adapters",
      "value": "No additional adapters are needed to convert the stroller to a double.",
      "stated_as": "Easily converts your Gazelle S from a single to double stroller without additional adapters",
      "source_type": "listing",
      "source_url": "https://dd1dfe-a3.myshopify.com/products.json",
      "source_read_at": "2026-10-08T19:02:14.639Z"
    }
  ],
  "rows": [
    {
      "rank": 1,
      "merchant": {
        "slug": "albeebaby-com",
        "display_name": "albeebaby.com"
      },
      "product_id": "gid://shopify/Product/9722090717415",
      "name": "Bugaboo Donkey 6 Sibling Seat",
      "url": "/products/ucp/albeebaby-com/9722090717415",
      "why": "The sibling seat turns a Bugaboo Donkey 6 into a side-by-side double stroller for a second child.",
      "cells": [
        {
          "column": "Safety standard",
          "fact": {
            "field": "safety certifications",
            "value": "The Bugaboo Donkey 6 is certified to ASTM F833 (latest version), ASTM F2050 (latest version) and by the Juvenile Products Manufacturing Association (JPMA).",
            "stated_as": "The Bugaboo Donkey 6 is certified by:\n     - ASTM F833 (latest version), ASTM F2050 (latest version) and the\n     Juvenile Products Manufacturing Association (JPMA).",
            "source_type": "manual",
            "source_url": "https://www.bugaboo.com/on/demandware.static/-/Library-Sites-BugabooSharedLibrary/default/dwdce7f736/PDFs/User%20guides/Online%20UG%20Donkey%206%20NA.pdf",
            "source_read_at": "2026-10-09T06:56:39.535Z"
          }
        },
        {
          "column": "Age and weight",
          "fact": {
            "field": "age and weight limit",
            "value": "The store listing says the sibling seat is for children from 6 months up to 22 kg (50 lbs), while the Donkey 6 North American manual says the seat maximum is 23 kg (50 lbs); the sources disagree on the kilogram limit.",
            "stated_as": "For toddlers from 6 months to 22 kg (50 lbs)",
            "source_type": "listing",
            "source_url": "https://dd1dfe-a3.myshopify.com/products.json",
            "source_read_at": "2026-10-08T19:02:14.639Z"
          }
        },
        {
          "column": "Warranty",
          "fact": null
        },
        {
          "column": "Dimensions",
          "fact": {
            "field": "dimensions",
            "value": "Sitting space at the widest point with the footrest is 19.7 in long x 14.5 in wide x 17.3 in deep.",
            "stated_as": "Sitting Space (widest point with footrest): 19.7\" L x 14.5\" W x 17.3\" D",
            "source_type": "listing",
            "source_url": "https://dd1dfe-a3.myshopify.com/products.json",
            "source_read_at": "2026-10-08T19:02:14.639Z"
          }
        }
      ]
    },
    {
      "rank": 2,
      "merchant": {
        "slug": "albeebaby-com",
        "display_name": "albeebaby.com"
      },
      "product_id": "gid://shopify/Product/9579254350055",
      "name": "Thule Sleek 2 Sibling Seat",
      "url": "/products/ucp/albeebaby-com/9579254350055",
      "why": "Thule Sleek 2 Sibling Seat in Black converts a Thule Sleek 2 stroller into a sibling stroller.",
      "cells": [
        {
          "column": "Safety standard",
          "fact": {
            "field": "Safety standard",
            "value": "Manual lists ASTM F833-21.",
            "stated_as": "ASTM F833-21",
            "source_type": "manual",
            "source_url": "https://www.thule.com/-/s/approved/std.lang.all/33/69/1623369.pdf?rev=1.2",
            "source_read_at": "2026-10-11T06:40:53.258Z"
          }
        },
        {
          "column": "Age and weight",
          "fact": null
        },
        {
          "column": "Warranty",
          "fact": null
        },
        {
          "column": "Dimensions",
          "fact": {
            "field": "Dimensions",
            "value": "Dimensions are 32.7 x 17.1 x 43.5 inches.",
            "stated_as": "Dimensions (L x W x H): 32.7 x 17.1 x 43.5 in",
            "source_type": "listing",
            "source_url": "https://dd1dfe-a3.myshopify.com/products.json",
            "source_read_at": "2026-10-10T19:03:37.915Z"
          }
        }
      ]
    },
    {
      "rank": 3,
      "merchant": {
        "slug": "anbbaby-com",
        "display_name": "anbbaby.com"
      },
      "product_id": "gid://shopify/Product/9471020040478",
      "name": "Bugaboo Kangaroo Sibling Seat",
      "url": "/products/ucp/anbbaby-com/9471020040478",
      "why": "It is made for the Bugaboo Kangaroo stroller and adds a second seat for tandem use.",
      "cells": [
        {
          "column": "Safety standard",
          "fact": null
        },
        {
          "column": "Age and weight",
          "fact": {
            "field": "Age and capacity",
            "value": "The store recommends it from 6 months, with a maximum child weight of 40 lb (18 kg); it is not for newborns.",
            "stated_as": "No, it is suitable for toddlers from 6 months up to 40 lbs (18 kg).",
            "source_type": "guide",
            "source_url": "https://anb-baby.myshopify.com/products/bugaboo-kangaroo-sibling-seat-black-midnight-black-midnight-black",
            "source_read_at": "2026-09-24T15:02:48.356Z"
          }
        },
        {
          "column": "Warranty",
          "fact": {
            "field": "Warranty",
            "value": "The authorized retailer states that a full manufacturer warranty applies, but provides no duration or terms.",
            "stated_as": "Full Manufacturer Warranty",
            "source_type": "guide",
            "source_url": "https://anb-baby.myshopify.com/products/bugaboo-kangaroo-sibling-seat-black-midnight-black-midnight-black",
            "source_read_at": "2026-09-24T15:02:48.356Z"
          }
        },
        {
          "column": "Dimensions",
          "fact": {
            "field": "Seat dimensions",
            "value": "The seat measures 17.7 inches (45 cm) long by 11.8 inches (30 cm) wide.",
            "stated_as": "Seat length 17.7 inches (45 cm)\nSeat width 11.8 inches (30 cm)",
            "source_type": "guide",
            "source_url": "https://www.bugaboo.com/us-en/kangaroo-seat-accessories/bugaboo-kangaroo-sibling-seat-black-moon-grey-moon-grey-100281023.html",
            "source_read_at": "2026-09-24T15:02:50.805Z"
          }
        }
      ]
    },
    {
      "rank": 4,
      "merchant": {
        "slug": "albeebaby-com",
        "display_name": "albeebaby.com"
      },
      "product_id": "gid://shopify/Product/9564471230695",
      "name": "Cybex Gazelle S Seat Unit",
      "url": "/products/ucp/albeebaby-com/9564471230695",
      "why": "The second seat converts the Gazelle S from a single to a double stroller so two children can ride at once.",
      "cells": [
        {
          "column": "Safety standard",
          "fact": null
        },
        {
          "column": "Age and weight",
          "fact": {
            "field": "weight limits",
            "value": "The US manual prints configuration limits of 35 lbs/15.9 kg and 50 lbs/22.7 kg; the global manual prints 15 kg and 22 kg, so the regional figures disagree.",
            "stated_as": "max. 35 lbs/15,9 kg   max. 50 lbs/22,7 kg",
            "source_type": "manual",
            "source_url": "https://shop.cybex-online.com/on/demandware.static/-/Sites-cybex-master-catalog/default/dwbe058d1e/pdfs/manuals/ST_GO_Gazelle_S_Seat_Unit_US/CY_171_6841_B0720_Gazelle_S_Seat_Unit_US_UG.pdf",
            "source_read_at": "2026-10-09T18:18:13.324Z"
          }
        },
        {
          "column": "Warranty",
          "fact": {
            "field": "warranty",
            "value": "Open-box purchases include a 1-year manufacturer's warranty and are final sale, not eligible for return or exchange.",
            "stated_as": "Open-box purchases include a 1-year manufacturer’s warranty. Please note, these items are final sale and not eligible for return or exchange.",
            "source_type": "guide",
            "source_url": "https://dd1dfe-a3.myshopify.com/products/cybex-open-box-gazelle-s-second-seat-almond-beige",
            "source_read_at": "2026-10-09T18:18:00.693Z"
          }
        },
        {
          "column": "Dimensions",
          "fact": null
        }
      ]
    }
  ]
}