《平人气象论》曰∶妇人手少阴脉动甚者，任子也。《阴阳别论》曰∶阴搏阳别，谓之
有子。《腹中论》曰∶何以知怀子之且生也？曰∶身有病而无邪脉也。《脉经》曰∶尺中之
脉，按之不绝，法妊娠也。滑伯仁曰∶三部脉浮沉正等，无他病而不月者，妊也。
凡妇人怀孕者，其血留气聚，胞宫内实，故脉必滑数倍常，此当然也。然有中年受胎，
及血气羸弱之妇，则脉见细小不数者亦有之，但于微弱之中，亦必有隐隐滑动之象，此正阴
搏阳别之谓，是即妊娠之脉，有可辨也。又胎孕之脉数，劳损之脉亦数，大有相似。然损脉
之数，多兼弦涩，胎孕之数，必兼和滑。此当于几微中，辨其邪气胃气之异，而再审以证，
自有显然可见者。
凡辨男女之法，自古及今，无不以阴阳二字为纲领。然言多矛盾，悉属疑似。兹余以坎
离之象定之，庶得其要。盖坎为天一之卦，坎中满，阳在内也；离为地二之卦，离中虚，阴
在内也。得坎象者为男，得离象者为女。所以男脉多沉实，沉实者，中满之象；女脉多浮虚
，浮虚者，中虚之象。无论人之老少强弱，脉之部位大小，但因象察象，无不如响之应，然
尤于两尺为最也，足称捷法。
《脉诀》云∶欲产之妇脉离经，沉细而滑也同名，夜半觉痛应分诞，来日日午定知生。
《质疑》谓离经之脉，即歇至者是也。在须臾却非病。
《素问·平人气象论》说：妇女手少阴心经的脉动特别明显，是怀孕的迹象。《素问·阴阳别论》说：尺部阴脉搏动有力，与阳部脉象有明显区别，这叫做怀孕。《素问·腹中论》说：怎么知道孕妇快要分娩了呢？回答说：身体虽然有不适症状，但脉象没有病邪的表现。《脉经》说：尺部的脉象，按之不绝，这是妊娠的脉象。滑伯仁说：寸、关、尺三部脉浮沉力度相当，没有其他疾病而月经停止的，就是怀孕。
大凡妇人怀孕，由于血液汇聚、气机郁结，胞宫内部充实，所以脉象必然比平常滑数加倍，这是理所当然的。然而，有中年受孕，以及气血虚弱的女子，脉象出现细小而不数的情况也是有的，但在微弱之中，也必定有隐隐约约的滑动之象，这正是“阴搏阳别”的含义，这就是可以辨别出的妊娠脉象。另外，胎孕的脉象数（快），虚劳损伤的脉象也数，两者非常相似。但是，虚损脉象之数，多兼带弦涩；胎孕脉象之数，必定兼带和缓滑利。这应当在细微之处，辨别邪气与胃气的不同，再结合证候进行审查，自然会有明显的区别。
大凡辨别胎儿性别的法则，从古至今，无不以“阴阳”二字为纲领。然而说法多有矛盾，都属于似是而非。现在我以坎卦和离卦的形象来判定，希望能抓住要领。盖坎卦是天一之卦，坎卦中间是实的，象征阳气在内；离卦是地二之卦，离卦中间是虚的，象征阴气在内。得到坎卦形象的是男孩，得到离卦形象的是女孩。所以男胎的脉象多沉实，沉实是中满的形象；女胎的脉象多浮虚，浮虚是中虚的形象。无论人的老少强弱，脉的部位大小，只要通过形象观察形象，没有不灵验如响应的，尤其在两尺部最为准确，堪称快捷之法。
《脉诀》说：临产妇女的脉象称为“离经”，表现为沉细而滑。如果在半夜感到疼痛，应该分秒必争准备分娩；到了第二天中午，一定知道孩子出生了。《质疑》认为，“离经”的脉象，就是脉律不齐、时有歇止的现象。这在临产时并非病态。
The *Ping Ren Qi Xiang Lun* (Treatise on the Pulse Manifestations of Healthy Persons) states: When the pulse of the Hand-Shaoyin Heart Meridian (Heart Channel) moves vigorously in women, it indicates pregnancy. The *Yin Yang Bie Lun* (Treatise on the Distinction of Yin and Yang) states: When the Yin pulse (typically referring to the Chi/Renal position) beats strongly and is distinct from the Yang pulse, it is called having a child. The *Fu Zhong Lun* (Treatise on the Abdomen) asks: How do we know that a pregnant woman is about to give birth? It answers: The body has symptoms, but the pulse shows no signs of pathogenic factors. The *Mai Jing* (Pulse Classic) states: If the pulse at the Chi (Cun-Kuan-Chi three positions, specifically Chi) position remains unceasing upon pressure, this is the method for identifying pregnancy. Hua Tuoboren (Slip Bo Ren) stated: When the pulses at the three positions (Cun, Guan, Chi) are equal in floating and sinking depth, with no other illness present, yet menstruation has ceased, it is pregnancy.
Generally, when a woman is pregnant, blood gathers and Qi accumulates, making the Bao Gong (Uterus) internally full; therefore, the pulse must be slippery and rapid, double the normal rate, which is natural. However, in cases of conception in middle age or in women with deficient Qi and Blood, the pulse may appear fine and small without being rapid. Yet, within this weakness, there must inevitably be a faint, sliding sensation. This is precisely what is meant by "Yin beating distinctly from Yang," which constitutes the identifiable pulse of pregnancy. Furthermore, the pulse of pregnancy is rapid, just as the pulse of consumptive disease (Lao Sun) is also rapid, making them quite similar. However, the rapidity of a consumptive pulse often accompanies wiry and choppy qualities, whereas the rapidity of a pregnancy pulse must accompany harmonious and slippery qualities. One must distinguish between the presence of pathogenic Qi and Stomach Qi (digestive vitality) in these subtle details, and further verify with clinical manifestations, where the differences will become clearly visible.
Regarding the method for distinguishing fetal gender, from ancient times to the present, all have used the concept of Yin and Yang as the guiding principle. However, statements are often contradictory and ambiguous. I now determine this based on the images of Kan (Water) and Li (Fire) trigrams, hoping to grasp the essence. Kan is the trigram of Heavenly One; its center is solid, symbolizing Yang residing inside. Li is the trigram of Earthly Two; its center is hollow, symbolizing Yin residing inside. Obtaining the image of Kan indicates a male fetus, while obtaining the image of Li indicates a female fetus. Therefore, the pulse for a male fetus is often deep and solid (Chen Shi), reflecting the image of internal fullness; the pulse for a female fetus is often floating and empty (Fu Xu), reflecting the image of internal hollowness. Regardless of a person's age or strength, or the size of the pulse position, observing the image through the image yields results as responsive as an echo. This is particularly accurate at the two Chi positions, making it a swift method.
The *Mai Jue* (Pulse Rhymes) states: The pulse of a woman in labor changes to "Li Jing" (Departing from the Standard), appearing deep, fine, and slippery. If pain begins at midnight, delivery should occur shortly; by noon the next day, birth is certain. The *Zhi Yi* (Questions and Doubts) asserts that the "Li Jing" pulse refers to intermittent pulses (Xie Zhi). In this context, such intermittency is not a disease.