Zohar, Tazria
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וְאִם נְקֵבָה תֵלֵד. כְּמָה דְּאוֹקִימְנָא, דְּשַׁלְטָא סְטָר שְׂמָאלָא יַתִיר וְאִתְכַּפְיָא יְמִינָא, וְעַל דָּא כֹּלָּא עַל חַד תְּרֵין, רְחִיקָא נוּקְבָּא, מִדְּכוּרָא, לְאִתְקַשְּׁרָא רוּחָא בְּגוּפָא, דְּהָא שְׂמָאלָא לָא אִתְיַישְׁבָא הָכִי כִּימִינָא, וְאִשְׁתְּכָחַת בְּתוּקְפָא יַתִיר.
The Zohar; London, Soncino Press, 1933
In the case of a female double the number of days is required, because, as stated above, the side of the left is predominant, and therefore it takes twice as long in the case of a female for the spirit to be united with the body.’