Elven women remain fertile from around the time of their coming of age to approximately their 550th birthday. Elven fetuses gestate for approximately twelve lunar cycles (from new moon to new moon) of the Selunite moon (900 days, 30 months). At some time between the sixth and seventh cycles, the child's budding consciousness reveals itself to the mother. Over the coming cycles, she gradually begins to sense what kind of person her child will become. She selects a name for the growing baby, which it recognizes and accepts.
Drow operate from new moon to new moon of the Eilistraeen moon instead; 360 days, 12 months. It is common for pregnant Drow to carry twins or even triplets. In such cases, multiple births remain rare as the strongest of the fetuses feeds on its siblings in the womb. Pregnant Drow sometimes feel these mortal combats occur in their bellies. Such prenatal battles produce in their mothers a euphoric sensation, referred to in the Undercommon Tongue as "Chad-zak." The feeling is infinitely stronger than anything normally produced in the bedchamber, and can occur up to four times per multiple pregnancy. It usually happens early in the third trimester. Mothers who experience repeated chad-zaks usually feel them in quick succession, once every one or two days. The final chad-zak indicates one fetus's successful slaying of its rivals.
Drow children grow up faster than other elves; as by the age of 8, children can walk, talk, and speak. All drow children, even those unable to walk, feel an instinctive homicidal impulse toward their siblings. Most drow youngers happily kill playmates if given opportunity. Students might be caged, doused with scalding or freezing water, poked with sharpened sticks, poisoned, burned, or simply pulverized with fists and clubs as punishments for misbehavior.