Every parent wants their baby to be smart and healthy. In order to ensure the healthy growth of the fetus, pregnancy tests are very necessary and the examination during pregnancy is a basis for eugenics. It is rare to wake up a fetus, but in order to avoid a malformed fetus, the following ten types of mothers-to-be must do a good teratology examination: 1, age 38 years or older: Because of the aging of eggs, or even more abnormal, the risk of congenital malformation or congenital stupid fetus output of older pregnant women is greater, so teratology examination should be conducted. 2. Pregnant women whose husbands are older than 55 years old: Even if the pregnant women are younger, the risk of producing congenital malformed babies is higher due to aging of male sperm. Women who have given birth to abnormal fetuses: Women who have given birth to anencephaly, spina bifida or other abnormal fetuses should undergo teratology screening after another pregnancy. This is because they have a higher chance of having a similar type of abnormal child than the average pregnant woman. 4, habitual miscarriages: women who have habitual miscarriages, a history of premature births or multiple fetal deaths in utero should undergo a teratology examination after they become pregnant again. Because this is often caused by chromosomal abnormalities in one or both spouses, another pregnancy may still have a teratogenic fetus. 5, the family has a genetic disease: family has a genetic disease or the pregnant woman herself had a hemophilia, color blindness, anal atresia, progressive muscular dystrophy and other genetic diseases, after another pregnancy should predict the sex of the fetus, and selective abortion. This is because the genetic disease is related to gender, the mother only passed to the son, the daughter can be safe and sound; while the father only passed to the daughter, the son is safe and sound. 6, there are congenital metabolic function defects in the family: or pregnant women who have given birth to children with metabolic function defects, should do teratology examination. 7, pregnant women in the third month of pregnancy infected with viruses: Anyone who has suffered from rubella, herpes zoster, herpes simplex, cytomegalovirus disease and other viral infections or mycoplasma, chlamydia infection, easy to transmit to the fetus, the risk of child development malformation is high. 8, early pregnancy has received radiation exposure: pregnant women have used drugs that can cause fetal malformation or received radioactive substances, easy to cause fetal malformation, should do a teratology examination. 9, the couple often exposed to adverse factors: such as radioactive substances, pesticides, harmful environment, etc. 10.Pets kept at home: Because keeping pets can infect pregnant women with toxoplasmosis and lead to embryo or fetal infection, so toxoplasmosis antibody test should be done before pregnancy to avoid adverse consequences. Pregnant women who have one of the above 10 conditions should preferably undergo prenatal teratology examination in the third to fourth month of pregnancy.