Take a look at this article
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.agry.purdue.edu/turfnew/pubs/bermudagrassguide.pdf&ved=2ahUKEwj0m7_M-tbbAhXH2VMKHQNBBw4QFjAJegQIBRAB&usg=AOvVaw00Bld8Zw4zuZxlsKwE5e5i
It has a nice list of herbicides you can use and bermuda's tolerance. Pay attention to the timeline.
Example 1 wae. 1 week after emergence.
Emergence is defined as a uniform stand of one-leaf seedlings about 0.5 inches tall.