Why doesn't the Stroller Seat lock in side-facing position? December 19, 2019 07:14 The Stroller Seat only locks securely in rear-facing or forward-facing position for safety and stability reasons. Related articles Can I use the Stroller Seat or Bassinet in the car? What are the size requirements for children using the Stroller Seat? Does Orbit Baby sell car seat adapters for other brand car seats? What's the best way to clean my stroller or car seat? Can I fold the Stroller Base with the Stroller Seat attached?