On May 5, 2017 physical therapist Taryn Bader, PT, DPT of Onondaga Physical Therapy attended a full-day seminar in Syracuse, NY titled:  

The Fundamentals of Pelvic Floor Rehabilitation

The course was six hours of educational material focused on 

Diastasis Recti is a condition that typically occurs following a pregnancy in which the two halves of your abdominal muscle splits.  There may be a gap you can feel between the walls of the abdomen, usually around the belly button.  Occasionally there may be a bulge present, depending on the size of the diastasis.

Can it be fixed?