When do I have to stop swaddling?

Reviewers and safe-sleep guidance consistently point to the moment a baby shows signs of rolling over—usually somewhere around 8–12 weeks—as the cut-off for any arms-in swaddle. Several parents in the communities we read specifically chose transition-friendly designs (like HALO's 3-way adjustable sack or arms-up styles that ease the move to a sleep sack) to make that switch less disruptive.