It's rather common when you leave a doe in with males.
This has not been my experience. I have many times set up temporary "colonies" of several does and a buck for 3 weeks or so (or even just one doe with the buck, if they seem to get along well enough), and not once have I had a doe deliver a second, later litter from that sort of arrangement. About 30 years ago, I had a Jersey Wooly doe deliver 3 babies, and a few days later, 3 more, but that was from a typical, one-time-only breeding.
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