It is not recommended for women to have nail art during pregnancy preparation because some nail polish used for nail art contains many toxic and harmful substances. For example, phthalates, which interfere with the normal secretion of hormones, can seriously damage reproductive health, and chemicals such as benzene and formaldehyde contained in nail polish are also carcinogenic. If a woman uses nail polish containing these toxic substances during pregnancy preparation, it will be absorbed by the body and will stay in the body, which will have an adverse effect on the embryo if she gets pregnant, and some of them will even affect the normal development of the embryo, such as developmental malformations, and in serious cases, even cause embryonic development to stop or miscarriage. Even if the pregnancy is successful, these toxic substances will affect the healthy development of the fetus and the health of the pregnant woman. From the point of view of eugenics, it is not recommended to use any cosmetics during the preparation of pregnancy.