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Chao Yuanfang stated: After conception, the fetus in the abdomen changes every seven days. Currently, among women who suffer miscarriage, it occurs more frequently in the third, fifth, and seventh months of pregnancy, and less frequently in the second, fourth, and sixth months. Zang organs are Yin, while Fu organs are Yang. The third month corresponds to the Heart, the fifth month to the Spleen, and the seventh month to the Lung; these all belong to the meridians of the Five Zang organs. Since Yin is prone to deficiency, miscarriage is common. If a miscarriage occurred in the third month previously, and upon conceiving again, another miscarriage happens at the third month, it is because the Heart Meridian (the meridian governing the heart's functions) has been injured, and the Heart must be regulated first. The same applies to the fifth and seventh months, except that miscarriage in the first month is generally unknown to people. The first month corresponds to the Liver. Anger often leads to miscarriage, and washing the lower body opens the orifices, which can also cause miscarriage. Once a miscarriage has occurred, the Liver Meridian is injured, making subsequent pregnancies prone to miscarriage. Most of those currently childless have suffered from miscarriage in the first month; they are not necessarily infertile. Therefore, after initial intercourse, one should best rest and recuperate, avoid further sexual intercourse to disturb the Uterus, avoid fatigue and anger, avoid lifting heavy objects, avoid bathing, and frequently take herbs to nourish the Liver and calm Qi, so that the Fetus will be secure.

Sun Simiao in *Qianjin Fang* stated: For any woman who suffers miscarriage after three months of pregnancy, although there may be insufficient Qi and Blood, it is primarily due to injury to the Zhongchong Mai (i.e., the Stomach Meridian of Foot-Yangming, which supplies nutrition for pregnancy). At this stage, one must regulate diet, abstain from sexual desire, and guard against anger, thereby avoiding the disaster of miscarriage.

Pan Shuofu stated: Chao's theory discusses how various meridians nourish the Fetus, each for thirty days. Among the Twelve Regular Meridians, only the Heart and Small Intestine do not directly nourish the Fetus. Why? The Heart is a Yang Zang organ (Mu Zang), and the Small Intestine is a Fu organ, primarily responsible for generating Blood and connecting with the vessels. The Classics state that "the true Qi of the Zang organs communicates with the Heart," and the Heart stores the Qi of the blood vessels. During pregnancy, the flow of meridians is obstructed, as Scholar Xu described: closing the menstruation to nourish the Fetus. Thus, we know that the Fetus is based on Blood, and its entire process concerns the Heart; therefore, it is inappropriate to distribute nourishment sequentially among the meridians. In the third month of pregnancy, the Pericardium (the protective outer layer and meridian surrounding the Heart) nourishes the Fetus. *Ling Shu* states that the Pericardium governs the function of the vessels. If Qi and Blood are diverted to nourish the Fetus, the pulse will inevitably appear deficient and intermittent. The Classics say "the Heart harmonizes with the vessels." Although the Heart and Pericardium are divided into two meridians, they essentially belong to the same Zang organ. If, at the appointed time for a specific meridian to nourish the Fetus, that meridian's deficiency and excess are unregulated, the Fetus will become unstable, and in severe cases, vaginal bleeding and miscarriage will occur.