My Doctor Has Offered to Suture my Rectus Abdominis to Fix my Diastasis Recti During my 2nd C-section. What Would You Advise?

There is a proper way to repair diastasis. It's unlikely gynecologist has had a lot of experience doing this. I would ask her to refer you to plastic surgeon.

The best advice is to have the C-section first . Then have the divarication repair as an elective procedure  performed by a plastic surgeon.

Its a very tempting offer to get the diastasis fixed at the same time as the C Section.

3 important considerations. 1. In the post pregnancy state the blood vessels are engorged and the risk of bleeding is high. 2. To get access to the entire diastasis, your Doctor has to lift the skin of the tummy for a considerable distance. This adds to the time and increases the risk of bleeding and fluid collection etc etc 3. You should ask your Doctor, whether it is a common procedure and what is his/her success rate.

Having watched my five children born by c-section, I personally don't see how an OB would have access to do the repair without considerably expanding the operation just as you are taking responsibility for a new born. However, if your OB has done this before with good results, I would yield to his/her experience. All the best.