Dongui Bogam_04_The Start of Conception

[胎孕之始]
[The Start of Conception]

聖惠方曰, 天地之精氣化萬物之形, 父之精氣爲魂, 母之精氣爲魄. 
一月懷其胎如酪. 二月成其果而果李相似. 三月有形像. 四月男女分. 五月筋骨成. 六月鬢髮生. 七月遊其魂而能動右手.
八月遊其魄而能動左手. 九月三轉身, 十月滿足, 母子分解. 其中有延月而生者富貴而壽, 有月不足者貧賤而夭.

It is said in the Great Peace and Sagely Benevolence Formulas (聖惠方), 
"The essence-qi of the heaven and earth forms the shape of all living things, in which the paternal essence-qi composes the heavenly soul魂 and maternal essence-qi composes the earthly soul魄. 
The fetus is like milk in its first month as it becomes a seed, and looks like a plum in its second month, and forms the shape of a human in its third month. 
Its gender can be specified in its fourth month; 
the sinew and bones are formed in its fifth month; 
hair is grown in its sixth month. 
The right hand can be moved by controlling the ethereal soul in its seventh month, 
and the left hand can be moved by controlling the corporeal soul in its eighth month. 
The fetus turns its body three times in its ninth month, 
completes itself in the tenth month, and comes out from the mother's womb. 
Among the babies, those who fulfilled the ten months, live rich and long, those who have not fulfilled the ten months, live poor and die young." 

上陽子曰, 人初受氣也, 九日而陰陽大定, 四十九日而始胎. 然後七日而一變. 故滿三百有六日者, 滿二百九十六日者, 皆上器也. 有二百八十六日者, 二百六十六日者, 中器也. 有二百五十六日者, 二百四十六日者, 下器也. 盖天干甲必合己而方生, 地支丑必合子而方育, 自非天地合德, 則人必不生也. 故云, 九月神布氣滿而胎完, 亦云, 十月懷胎也. 此天地之德合於氣而後生也.

Shangyangzi (上陽子) said, 
"When a human takes qi inside the womb, yin-yang is determined on the ninth day, forms the shape of a fetus after forty-nine days, and changes every seven days. 
Therefore, a baby who completes itself in 296 to 306 days is of the highest level, 
a baby who completed in 286 to 266 days is of the middle level, 
and a baby who completed in 256 to 246 days is of the lowest level. 
Generally, Gap(甲) must be united with Gi(己) in the heavenly stems to be fertile, and Chuk(丑) must be united with Ja(子) in the earthly branches to nurture. This implies how the virtue of heaven and earth must be united together with their qi to bear a child; hence the saying, "The spirit is spread out and gi becomes abundant on the ninth month to complete the growth of a fetus.' and 'The womb bears the fully grown fetus by the tenth month.'"