《病源论》云∶阴搏阳别谓之有子者，此是气血和调，阳施阴化也。诊其手少阴脉动甚
者，妊子也。尺中之脉，按之不绝者，妊娠也。
《产经》云∶凡妇人三部脉，浮沉正等者，此谓有子也。（今按∶《八十一难》云∶从掌
后三寸为三部，则寸与关尺各得之寸一。凡诊脉者，先明三部九候。）
《短剧方》云∶凡妇人虚羸，血气不足，肾气少弱；或当风取冷大过，心下有痰水者，
欲有胎，便喜病阻。何谓欲有胎，其人月水尚来，颜色肌肤如常而沉重愦闷。不用饮食，不
知其患所在，脉理顺时平和。则是欲有胎也。如此经二月日后，便觉不通，即结胎也。（《玉
房秘诀》云∶初施泻妇阴 阳有力如吮者，是有子之候也。）
《太素经》云∶玄元皇帝曰∶人受天地之气，变化而生，一月而高（膏），二月而脉，
三月而胞，四月而胎，五月而脉筋，六月而骨，七月而成形，八月而动，九月而臊，十月而
生。
《周书》云∶人感十而生，天五行，地五行，合为十也。天五行为五常，地五行为五脏，
故《易》曰∶在天成象，在地成形者也。
《家语》云∶天一，地二，人三，三三而九，九九八十一，一主日，日数十，故十月生。
《玉房秘诀》云∶阳精多则生男，阴精多则生女，阳精为骨，阴精为肉。
The *Zhubing Yuanhou Lun* (Treatise on the Pathogenesis and Manifestations of All Diseases) states: "When the Yin pulse beats vigorously and differs from the Yang pulse, it is called pregnancy. This indicates that Qi and Blood are harmonized, Yang energy is disseminated, and Yin essence is transformed." When palpating the pulse of the Hand-Shaoyin Heart Meridian, if the pulsation is markedly vigorous, it indicates conception. If the Chi (Cun-Kuan-Chi) pulse remains unceasing upon deep pressure, it indicates pregnancy.
The *Chan Jing* (Classic of Childbirth) states: "In women, when the pulses at the three positions (Cun, Guan, Chi) are equal in depth and force during both superficial and deep palpation, this is termed pregnancy." (Current commentary: The *Nan Jing* [Classic of Difficult Issues], Chapter 81, states: 'Three cun distal to the radial styloid process constitute the three positions; thus, each of the Cun, Guan, and Chi positions spans one cun.' Physicians must first understand the principle of the Three Positions and Nine Palpations.)
The *Duan Ju Fang* (Short Formulas) states: "In women who are weak and emaciated, deficient in Qi and Blood, with weak Kidney Qi; or those who have excessively exposed themselves to wind and cold, resulting in phlegm-fluid retention in the epigastrium, when they desire conception, they may easily experience obstruction and illness. What does 'desiring conception' mean? The menstruation still arrives regularly, complexion and skin appear normal, yet the person feels heavy and mentally confused. There is a lack of appetite, the location of the ailment is unknown, and the pulse appears smooth and peaceful when regulated. This indicates a state of desiring conception. After two months from such a state, menstruation ceases, indicating that the fetus has formed." (The *Yufang Mijue* [Secrets of the Jade Chamber] states: "If upon initial ejaculation, the woman's vagina contracts powerfully as if sucking, this is a sign of conception.")
The *Tai Su Jing* (Grand Simplicity Classic) records: "The Xuan Yuan Emperor (Laozi) said: Humans are born through change by receiving the Qi of Heaven and Earth. In the first month, the embryo forms (gao); in the second month, vessels develop; in the third month, the uterus is established; in the fourth month, the fetus takes shape; in the fifth month, sinews grow; in the sixth month, bones form; in the seventh month, the form is complete; in the eighth month, fetal movement occurs; in the ninth month, hair grows (sao refers to body hair); and in the tenth month, birth occurs."
The *Zhou Shu* (Book of Zhou) states: "Humans are generated by the number ten. Heaven has Five Elements, Earth has Five Elements, combining to make ten. The Five Elements of Heaven correspond to the Five Constants, and the Five Elements of Earth correspond to the Five Zang Organs. Thus, the *I Ching* [Book of Changes] says: 'Heaven manifests images, Earth manifests forms.'"
The *Kongzi Jiayu* (Family Sayings of Confucius) states: "One is Heaven, Two is Earth, Three is Humanity. Three times three makes nine; nine times nine makes eighty-one. One governs the day. Since there are roughly thirty days in a lunar month, ten months result in birth."
The *Yufang Mijue* (Secrets of the Jade Chamber) states: "Abundant Yang essence produces a male; abundant Yin essence produces a female. Yang essence constitutes bone, and Yin essence constitutes flesh."