Is It Possible for the Pocket To Widen By Movement After Surgery?

At 6 weeks, it is extremely unlikely that movements that you engage in will enlarge the pocket that the implant is in. Of course, the skin can stretch with muscle contraction (which is different than "widening"), much more so with saline than with silicone implants and greater with large saline implants (yours are not extremely large).

Hello,

The answer depends on each individual, but by-and-large the amount that a breast pocket can be changed by movement is minimal especially weeks after surgery.  If the pocket is over dissected and significant and consistent pressure is applied the pocket can be enlarged in the direction of the pressure, particularly on the side toward the arm pit.

All the best,

Dr Repta