What the Sibling Seat Can Do
The Nuna Demi Next sibling seat is a full-featured second seat that mirrors the main seat. It connects directly to the Demi Next frame — no adapters needed — and can be placed in the top or lower position. It supports forward or rear-facing from birth up to 50 lbs (22.7 kg) and up to 45” (114.3 cm).
Before You Start
This seat is designed exclusively for the Nuna Demi Next stroller frame. It will not attach to other strollers. Make sure your frame is stable and on a flat surface before beginning.
Attaching the Sibling Seat
Follow these steps to install the sibling seat securely.
- Position the seat on the frame: Align the seat connectors with the frame mounting points. You can choose the top or lower position depending on your child’s age and your preference.
- Click into place: Push the seat onto the frame until you hear an audible click. Gently tug to confirm it is locked.
- Choose forward or rear-facing: The seat can face forward or rearward. Lift the seat off the frame, rotate it, and reattach it in the desired direction.
- Adjust recline and leg support: Use the one-hand recline lever to choose from four recline positions. Adjust the calf support and footrest to match your child’s leg length.
Harness and Comfort Adjustments
The quick-release 3-to-5-point no-rethread harness grows with your child — no need to rethread straps as they get taller. The all-season seat has a plush knit panel for winter that converts to breathable mesh for summer. A water-repellent UPF 50+ canopy, removable Merino wool insert, built-in privacy drape, and ventilation panels are included.
Key Specs at a Glance
- Nuna - Demi Next Sibling Seat - Biscotti: Weight limit: birth to 50 lbs (22.7 kg). Height limit: up to 45” (114.3 cm). This tells you how long the seat will fit your child — from newborn through toddler years.
Nuna - Demi Next Sibling Seat - Biscotti - Nuna - Demi Next Sibling Seat - Biscotti: Connects to Demi Next frame in top or lower position with no adapters. No extra parts to buy or lose; installation is straightforward.
- Nuna - Demi Next Sibling Seat - Biscotti: Four recline positions, one-hand adjustable calf support and footrest, no-rethread harness. Adjustments are quick and easy, even with a wiggly child.
Care and Safety Notes
The seat includes a rain cover. For cleaning, follow the care instructions on the seat’s fabric tag. The supplied information does not include detailed washing steps, so treat stains promptly with mild soap and air dry. Always use the seat only with the Demi Next frame.
