Playing mahjong during pregnancy will not directly lead to fetal development deformities, but playing mahjong on the normal development of the fetus, pregnant women’s health is unfavorable, playing mahjong as an indoor activity, first of all, due to prolonged sitting will affect the pelvic area of the blood circulation, which may affect the blood supply of the placenta, so that the umbilical cord of the oxygen saturation is reduced. Secondly, when playing mahjong the indoor environment is relatively closed, the air does not circulate, there may also be smoking, noise and so on, these adverse factors are also unfavorable to the development of the fetus. Then playing mahjong will certainly win or lose, easy to affect the pregnant woman’s mood changes, which causes fetal movement or fetal heart rate changes. Finally, playing mahjong will easily cause fatigue in the waist tissue of pregnant women, aggravating the symptoms of pregnancy waist pain, if the night mahjong will also seriously affect the rest, is not conducive to the secretion of hormones in the body, which will have a negative impact on the normal development of the fetus.