Have you been doing any particular exercises to try and resolve the stomach muscle separation?

I had 5-6cm after DS, and was referred to hospital physio, then got the separation back to about 2.5 before being discharged by hospital physio. Since then I have started reformer Pilates and I think is really helping, I have a little flab on the front but behind I can feel it is coming back into shape.

I would go see a physio, see if you can get a recommendation for one specializes in post pregnancy issues and get their opinion on whether their are specific exercises you can do to help, at least till you get to see the specialist (I believe sometimes surgery is the only option).