Pregnant women during pregnancy has been living in formaldehyde exceeding the standard house baby may not necessarily unhealthy, but prone to health problems. Just renovated house, if the existence of formaldehyde exceeds the standard is not suitable for pregnant women to live, on the physical health of pregnant women and fetal growth and development may be affected to some extent. Especially in the early stages of pregnancy, if pregnant women are subjected to long-term stimulation of formaldehyde odor, may lead to intrauterine fetal development deformities, such as excessive or missing fingers and cleft lip and palate, etc., but also lead to an increased risk of miscarriage, in the mid-pregnancy may also lead to fetal neurological development abnormalities, resulting in the development of mental retardation of the child. Due to individual differences, formaldehyde levels, length of residence, etc., not all pregnant women will necessarily lead to abnormal fetal development or mental retardation and other aspects of the abnormality. Pregnant women in pregnancy must pay attention to do the relevant examination, if found fetal abnormalities need to be dealt with in a timely manner, otherwise it may lead to irreversible fetal abnormalities to terminate the pregnancy. Pregnant women who have been living in a house with excessive formaldehyde during pregnancy need to go to the hospital regularly for a good checkup and get out of the living environment with excessive formaldehyde as early as possible.