"Female embryos" refers to the early stage of development of an organism that has the potential to become a female. Embryos are the earliest forms of life in the womb before birth. Full definition
Male and female embryos start out with the same equipment, and then part ways. (newscientist.com)
These more robust female embryos may be better able to withstand stresses to pregnancy, the new paper argues, including stresses caused by relationship conflict. (sciencedaily.com)
Male embryos naturally grow larger than female embryos due to the larger amount of testosterone being produced in their bodies. (2ndchance.info)