How do I know if my diastasis is closed?
As your gap heals, the connective tissue separation will feel shallower when you put your fingers in the gap to measure. As the connective tissue becomes shallower, the muscles will come closer together.
Your diastasis is closed when the connective tissue at the belly button is shallow and the two muscle bellies are close together, maybe a finger width. By clinical definition one to two fingerwidths and shallow is not significant, but I find my clients with two fingerwidths can still greatly benefit in both waistline and strength by bringing it closer together.