If you have inhaled formaldehyde before preparing for pregnancy, you should generally have your body tested for physical standards. If there is no damage to organ function, the metabolic cycle time of formaldehyde in the body will be longer, and you can generally prepare for pregnancy after 3-6 months. However, during the preparation period, you also need to measure the formaldehyde in your living environment, and if the formaldehyde content exceeds the standard, you also need to avoid living in this environment before you can consider the issue of pregnancy. Formaldehyde is particularly harmful to pregnant women, especially in the early stages of pregnancy when the fetal organs are not yet formed and are particularly sensitive to external toxic and harmful substances. If the formaldehyde content exceeds the standard, it is easy to cause abnormal fetal organ development and fetal malformation. Therefore, for couples preparing for pregnancy, avoid exposure to formaldehyde before preparing for pregnancy, and after pregnancy should also avoid exposure to this toxic and harmful substances.