Eating cold during pregnancy has nothing to do with whether your newborn has a birthmark. Eating cold during pregnancy is generally not associated with whether or not the newborn has a birthmark. Eating cold during pregnancy may affect the gastrointestinal function of the pregnant woman, resulting in abdominal pain, diarrhea and other discomforts. Since the intestines and the uterus are adjacent organs, if the diarrhea is severe, diarrhea can cause the intestines to peristalsis too quickly and excessively, which can irritate the adjacent uterus and cause uterine contractions that can lead to miscarriage or preterm labor. The cause of birthmarks in newborns is unknown, and may be formed due to abnormal proliferation or accumulation of embryonic melanocytes caused by the environment, genetics, drugs, and mental factors, which generally have no effect on health. During pregnancy, pregnant women should pay attention not to contact with harmful substances, do not take drugs harmful to the fetus, try to maintain a good mood, and pay attention to regular obstetric examination during pregnancy.