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Designed for the Mockingbird Single-to-Double Stroller the 2nd Seat Kit allows you to add an additional seat to your Stroller and choose from tons of useful two-seat arrangements. Mockingbird’s top and bottom seats are interchangeable so you can use both of them with children up to 45 lbs. Adding on the 2nd Seat takes about 30 seconds. To use the Stroller from birth you can add a Mockingbird Car Seat Adapter to pair with your compatible infant car seat a Mockingbird Carriage or a Mockingbird Infant Seat Insert all sold separately. For twins it’s recommended to use the 2nd Seat Kit with two Infant Seat Inserts or with two identical car seats. Please note: Mockingbird updated the 2nd Seat Kit adapters to allow for an additional seating configuration: infant up top parent-facing in an infant car seat and toddler facing outward on the bottom. These updated adapters are standard with all new 2nd Seat Kits as of June 2021.