Hospital does it for you!
I called when I had my daughter and they backdated her coverage for when she was born.
I’m in Oklahoma!! They will come in and help you set it up. You might have to fill out this paper work claiming baby boys date of birth and newborn testing. It was super easy and I have had no complaints!
Once my little boy was here, they called me before I even left the hospital asking to add him to my plan.