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 What are the size requirements for children using the Stroller Seat? How do I set up and use my G5 Stroller Seat and Cargo Basket? Can I use the Stroller Seat or Bassinet in the car? Does Orbit Baby sell car seat adapters for other brand car seats? How do I set up my Orbit Baby G5 Stroller?