During pregnancy to prevent fetal birthmark, it is best to pay attention to diet, usually can not eat food containing heavy pigment, such as soy sauce, vinegar, etc. Food contaminated by chemicals or pesticides can not be eaten, which can also cause fetal birthmark, pay attention to dietary hygiene, the local environment should be clean and hygienic, avoid pollutants around. Usually drink more milk, soy milk, it is recommended to eat more fresh vegetables, fruits, such as apples, bananas, cabbage, spinach and other foods, can not use cosmetics indiscriminately, because cosmetics contain chemical elements, containing heavy metals, also can not dye hair, perm, etc., will lead to pigment accumulation caused by the fetus birthmark. The most important thing is that you can drink more water during pregnancy to speed up your body’s metabolism and promote the excretion of harmful substances, and you need to protect yourself from the sun, as excessive ultraviolet radiation can also cause the fetus to grow birthmarks.