We do not have any female residents with children at my program, but my previous OMS attending in dental school had two children while in residency. Ultimately, these concerns are on a case-by-case basis depending on your personal situation. Has it been done before? Yes. Will it be done again? Yes.
If you want to do OMS you should do it. I can say without a doubt that residency with children will be more difficult, of course. But it's not impossible. What are your specific concerns?