Will a female guppy breed after she gives birth?

Yes, female guppies are able to continue reproducing after giving birth. As livebearers, guppies give birth to fully developed baby fish but they do not care for the young beyond release.

Following a pregnancy (which lasts on average between 21–30 days), a female guppy may rest for a 2-week period before becoming pregnant again. This gestation cycle can cause populations of this freshwater species to grow rather quickly in size.