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The *Book of Changes* states: "When the Qi of Heaven and Earth blends, all things are transformed with richness; when male and female essence interact, all things are born." This is likely the way of Heaven and Earth generating life, unchanged from ancient times to the present. The *Cranium and Fontanelle Classic* (*Lunxin Jing*) states: After conception, in the first month it is called a "bao tai" (fetal sac), which is the condensation of essence and Qi; in the second month, the fetal form appears, beginning as an embryo; in the third month, Yang Spirit transforms into the Three Souls; in the fourth month, Yin Spirit transforms into the Seven Po; in the fifth month, it corresponds to the Five Elements, differentiating the Five Zang Organs; in the sixth month, it corresponds to the Six Pitch-pipes, determining the Six Fu Organs; in the seventh month, essence opens the orifices, bringing light/vision; in the eighth month, Yuan Shen (Original Spirit) is complete, descending true spirit; in the ninth month, the palace (uterus) is fully structured to defend against external evils; in the tenth month, received Qi is sufficient, and all phenomena are formed. This growth and nourishment of the fetal origin follows natural creation, not human effort. However, the maternal Zang organ Qi protecting the fetus still follows an order like the four seasons: The Foot Jueyin Liver and Foot Shaoyang Gallbladder belong to Wood and prosper in Spring, nourishing the fetus in the first and second months; the Hand Jueyin Pericardium and Hand Shaoyang Sanjiao belong to Fire and prosper in Summer, nourishing the fetus in the third and fourth months; the Foot Taiyin Spleen and Foot Yangming Stomach belong to Earth and prosper in Late Summer, nourishing the fetus in the fifth and sixth months; the Hand Taiyin Lung and Hand Yangming Large Intestine belong to Metal and prosper in Autumn, nourishing the fetus in the seventh and eighth months; the Foot Shaoyin Kidney belongs to Water and prospers in Winter, nourishing the fetus in the ninth month. By the tenth month, the child's Qi is sufficient, waiting for the time to be born. Only the Hand Shaoyin Heart, the official of the sovereign and the viscera of Shen Ming (Spirit), although not governing a specific month alone, is present in every month. The nourishment of the fetal origin and the protection by Zang organ Qi can be said to be perfect. Yet, if human conduct is indulgent and destructive, how can one ensure the constancy of the Chong and Ren vessels? The *Xude Lu* says: People are eager to have children, but one must know that the way of childbirth lies in the interaction of essence and Qi, forming the fetus through solution. Therefore, those with few desires often have many children and they are easy to raise, because their Qi is solid and Essence is condensed; those with excessive desires often struggle to conceive and their children may die young, because their Qi leaks and Essence is thin. It is like brewing wine: adding one dou of water to one dou of rice makes strong and durable wine, preserving its substance; doubling the water makes it weak; tripling or quadrupling it results in neither wine nor water, losing its true Yuan Qi. Today, people indulge nightly, leaking essence recklessly, causing evil fire to rise and True Yang to become exhausted. How can they conceive? Even if they luckily bear a child, how can they guarantee its healthy development? Thus, those who conceive at a young age often have frail children, due to frequent desire and thin essence; those who conceive at an older age often have robust children, due to less desire and complete essence. Furthermore, those addicted to alcohol have their nature disturbed by wine, resulting in sperm that is half-true and half-damp-heat. Those diligent in desire, lacking restraint after pregnancy, secretly drain the mother's Yin and consume fetal Qi. Such indulgence and destruction likely stem from this. As ancients said, Father is Heaven and Mother is Earth. The father governs Yang giving, like rain and dew from heaven; the mother governs Yin receiving, like earth nurturing life. After conception, the condensation of Yang essence relies heavily on Yin Qi for protection. Thus, while in the womb, the fetus breathes and shares safety/danger with the mother. The mother's hunger/fullness, labor/rest, joy/anger/worry/fright, diet temperature, and cautious or reckless daily habits are all interconnected and share weal and woe. Ancient prenatal education is hard to describe in detail today. I only hope that pregnant mothers can regulate diet, adapt to cold and heat, abstain from anger, and reduce desires. This is the urgent task concerning the fetal sac; do not treat it as trivial and ignore it.