Fetal respiration, also known as "umbilical cord respiration" and "Tian Dan respiration", breathes through the umbilical cord like a baby. See "Bao Puzi Time Delay": "People with fetal interest can't breathe through their nose and mouth, such as in the womb." In other words, you don't have to breathe through your mouth and nose. If you are pregnant, it is fetal interest.

Fetal respiration is self-contained and is not affected by external respiration (lung respiration). When it enters the fetal rest state, it still naturally breathes outside the body, but if it exists, it will die. At the highest level, it can stop breathing through the nose and mouth. Fetal breath is the primitive state of life, which breeds the fundamental mystery of the nature of life in the universe. Through thousands of years' practice, the ancient monks in China found that fetal interest is the way and the door to longevity, and it is a good practice environment for the human body to eliminate diseases, rejuvenate and integrate with the universal spirit. Monks regard fetal interest as a high-level goal of cultivation.

Fetal rest is a very important practice method in Taoism. It was invented before the internal alchemy, but it is an indispensable part of the internal alchemy. The origin of fetal interest can be described as the understanding of fetal interest from China culture. At present, the academic research on "fetal interest" originated from Laozi, who realized the way of "returning to the fetus" and "returning to the infinite" through fetal interest.

Bigu, a traditional health preserving method, originated from Taoism in China, originated in the pre-Qin Dynasty, prevailed in the Tang Dynasty, and has a history of thousands of years in China. Peeping the Valley was first seen in Zhuangzi? Wandering around: "The mountain shot by the ancients is inhabited by immortals." If the skin is like ice and snow, if you are a virgin, you don't eat grains, suck the wind and drink dew, ride a dragon on a cloud, and travel around the world ... "Among them," Dai Dai Li Ji? "Yi Yisheng's core monument says:" Carnivores are brave, grain eaters are clever, gas eaters are alive, and those who don't eat are alive. "This is the earliest theoretical basis of the valley.

In short, Bigu is a unique traditional Taoist method, which can improve the internal environment of human body, enhance immunity and self-healing ability by not eating whole grains for a period of time, eliminating the filth in the body, adjusting the metabolic system of human body and purifying blood.

There is still a connection between the two, and fetal interest belongs to the Taoist advanced achievement method.