Congrats on the baby! I recently had a baby and am still on MA. I live in the North metro and went to Oakdale OBGYN - just check the website of an OB you are looking at to see if they accept MA - (most of them do) then though the county (I am in Wright) I was sent a packet of info where I got to pick if I wanted Medica/Blue Cross, etc. I went with Medica since they were a provider and listed in the book. I have been going to Oakdale OBGYN for the last 5 years since I had my son in 2004. They deliver at North Memorial in Robbinsdale and soon to be Maple Grove too.
MA is wonderful to have as you have no copays for anything and no out of pocket expenses. The baby gets to be on MA for the 1st year of their lives too, just make sure to call your case worker as soon as the baby is born and they will send you a form to add the baby.
I hope this helps and if you have any other questions just shoot me a message and i will be more than happy to help you out if I can.
E.