Formaldehyde has a great impact on pregnancy because it is highly toxic, not only carcinogenic but also teratogenic. If a pregnant woman is exposed to formaldehyde for a long time, her respiratory tract will be affected, and in serious cases, nasopharyngeal cancer and colon cancer, and even brain cancer will be induced, and mutations in cell nuclei will occur. Therefore, from the perspective of eugenics, women should try to stay away from formaldehyde before conception or in the early stages of pregnancy. If you find out you are pregnant just after your home has been renovated, you should not live in a house that has just been renovated. Because formaldehyde has to reach a certain concentration before you can smell it, it doesn’t mean there is no formaldehyde if you can’t smell it, so you should stay away from it for the sake of the fetus. So for women with childbirth requirements, the new house should be renovated and dried for at least six months before moving in.