The number 1 tip that I give to people who are working on healing their diastasis recti is to correct their pelvic alignment. Your core muscles cannot do their job well when the bones of the body (pelvis) are incorrectly position. Think about buying a house. When you look at a house one of the main aspects you look at is the foundation and the structure. You want to know if it is sound or if it is in need of repair.
Your pelvis is a major structure for supporting your core. If your pelvis is not in the proper position, it does not allow the core muscles to activate properly and it can also weaken the linea alba which is the connective tissue between the rectus abdominal muscles. When healing your diastasis recti it is important to allow the core muscles and the linea alba to be in the best position.
Check out this short video below on how to align your pelvis when standing, sitting, or lying on your back.