An haifi Barbara McClintock Eleanor McClintock a ranar 16 ga Yuni, 1902 a Hartford, Connecticut, na uku na 'ya'ya huɗu da aka haife shi ga likitan likitancin likitancin Thomas Henry McClintock da Sara Handy McClintock. Thomas McClintock shi ne ɗan baƙi na Birtaniya; Sara Ryder Handy ya fito ne daga tsohuwar iyalin Mayflower na Amurka. An haifi Marjorie, ɗan fari, a watan Oktoba 1898; Mignon, 'yar ta biyu, an haife shi a watan Nuwamba 1900. An haifi ƙarami, Malcolm Rider (wanda ake kira Tom), watanni 18 bayan Barbara. A matsayin yarinya, iyayenta sun yanke shawarar cewa Eleanor, "mai kyau" da kuma "mai hankali" suna, ba ta dace da ita ba, kuma ta zabi Barbara McClintock a 1919. McClintock ta kasance mai zaman kanta a farkon yaro, daga bisani ta gano ta a matsayin "clintocktock kadai".
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