Smelling formaldehyde in small amounts and for a short period of time in the early stages of pregnancy does not usually pose a risk to the development of the embryo. If you smell formaldehyde for a longer period of time or at a higher concentration, it may lead to embryonic abortion, spontaneous abortion, fetal developmental malformations, and intrauterine growth retardation. Pregnant women themselves may experience headaches, dizziness, fatigue, nausea, and vomiting can also increase the occurrence of pregnancy complications. Formaldehyde is a colorless, odorless, irritating gas that can irritate the respiratory and nervous systems and is carcinogenic and teratogenic. After pregnancy, women must pay attention to proper rest to avoid the stimulation of adverse factors and try not to live in a space containing formaldehyde. It is best to live in a clean air environment and to take vegetables and fruits to ensure the development of oneself and the fetus.