1. Can you check for fetal malformations in early pregnancy? No. Before 10 weeks of pregnancy, most of the organs of the fetus are not fully grown. Before the 10th week of pregnancy, all organs of the fetus are not fully grown, and after the 10th week, most of the organs are differentiated, but not perfect, plus the volume is too small, ultrasonography is difficult to distinguish their morphology. At present, after the 11th week of pregnancy, some more serious malformations can be detected, mainly anencephaly, dehiscence and severe spina bifida. 2.What is the content of mid-gestation ultrasound examination? Up to 20 weeks of pregnancy, the development of fetal internal organs is more mature, ultrasound examination can observe: fetal head bones and intracranial structure; spine; facial structure (mainly lip, to exclude cleft lip deformity); thoracic cavity and abdominal cavity of the main organs; limbs, larger long bones, and so on. The main malformations screened for include: anencephaly, meningoencephalocele, open spina bifida, thoracoabdominal cleft deformity, single ventricle deformity, and lethal chondrodysplasia. Many other malformations are affected by various factors and are more difficult to screen, so it is recommended to go to a reliable hospital for a more systematic screening during the 20-24 weeks of pregnancy. 3.Can all congenital malformations be detected by ultrasound? No, not really.