It is usually not recommended for pregnant women to soak in hot springs to avoid vaginal episodic infections that may affect fetal development. 1, affect fetal development: in early pregnancy, the embryo is in a critical period of cardiovascular and neurological development, and is sensitive to external teratogenic factors, the high temperature environment of hot springs may induce fetal malformations, so try to avoid staying in high temperature situations for too long, especially sauna, hot springs and other local high temperature environments, which are not conducive to fetal growth and development; 2, infection: when soaking in hot springs, women’s vagina may enter unclean bacteria inside the hot spring, thus inducing vaginitis during pregnancy, the lower resistance during pregnancy, pathogenic bacteria invasion easily lead to premature rupture of fetal membranes, inevitable miscarriage or preterm delivery, causing adverse pregnancy outcomes; 3, miscarriage or preterm delivery: soaking in hot springs due to the high temperature may increase the blood flow of the uterus, easily inducing contractions, thus causing the risk of miscarriage or preterm delivery; 4, affect the health of pregnant women: the environment inside the hot spring is not air circulation. And the high temperature may lead to dilatation of the peripheral blood vessels of pregnant women and a significant reduction in the amount of cardiac blood return, which can produce hypoxia, dizziness, dehydration, breathing difficulties and even fainting, which can easily lead to falls and slips, endangering their own safety and that of the fetus.