Well I also agree that Its depends on individual and also age plays a part. If you are a young mummy, not a problem to back back pre-preggie size within a short period of time. So you can do light exercise and also take diet food after few days.
Well Few months ago I had same problem of this dark circles then after I use Artistry Replenishing Eye Cream. I would recommend Artistry Replenishing Eye Creme which after using it, will show significant and continual improvement in the appearance of dark circles its really work.
Well This is really bad But I would suggest to wait for 3-4 days more. And after few days If these same situations then take him to the doctor where he born, I think that doctor will advice you better.