諸經要集 13.19

13.19

又處胎經云。人受胎時。初七日有四大。二七日展轉風吹向脇。乃至三十八七日。風名花令向產門。

Furthermore, the *Chutai jing* says: 'When a human conceives in the womb, during the first seven days the four great elements are present. During the second seven days, shifting wind blows toward the flanks, up to the thirty-eighth period of seven days, when a wind named Flower directs it toward the birth canal.'