Formaldehyde is a toxic chemical, inhalation of formaldehyde during pregnancy is detrimental to the healthy development of the baby. The specific effects need to be related to the concentration, dose and time of inhalation: 1, if only a small amount of formaldehyde is inhaled for a short period of time during pregnancy, it will not have a great impact on the baby’s development. 2, if formaldehyde is inhaled for a long time and in high concentrations in early pregnancy, it will lead to developmental malformations or miscarriage, stillbirth, congenital heart disease, etc., and will also cause hyperemesis gravidarum or gestational hypertension syndrome. 3, after the middle and late stages of pregnancy, if you inhale formaldehyde for too long, it is easy to lead to physical growth retardation of the baby, and even the possibility of fetal death in the womb.