自从６０年代孕妇为治疗早妊反应，在妊娠早期用一种镇静安眠剂反应停（ｔｈａｌｉｄｏｍｉｄｅ），在此阶段，大约１００００儿童受害。这种畸形儿有特定的类型，主要为海豹状肢体。回顾性调查说明，在早孕期服用过反应停的孕妇约１／３的新生儿发生畸形。从此推翻了胎盘是天? Since the early 1960s pregnant women treated for early pregnancy reactions, they used a sedative hypnotic thalidomide during the first trimester of pregnancy, during which period about 10,000 children were harmed. This deformity has a specific type of child, mainly for the seal-like limbs. A retrospective survey shows that in the first trimester pregnant women taking reaction stopped about 1/3 of newborns deformed. Since then the placenta is overturned?