据统计,20%的“唐氏儿”是由年龄大于35岁的孕妇所生,每一个怀孕的妇女都有可能生出“唐氏儿”。生唐氏儿的几率会随着孕妇年龄的递增而升高。唐氏综合征,俗称先天性痴呆。1866年,一位叫John LangdonDown医生第一次对唐氏综合征进行完整的描述而得名。1959年,研究人员证实了唐氏综合征是由染色体异常(多了一条21号染色体)而导致的,它是最常见的一种染色体疾病。大 According to statistics, 20% of “Down’s children” are born by pregnant women over 35 years of age, and every pregnant woman may have “Down’s children.” Raw Down’s chances will increase with the increasing age of pregnant women. Down’s syndrome, commonly known as congenital dementia. In 1866, a man named Dr. John LangdonDown first named after having a complete description of Down Syndrome. In 1959, researchers confirmed that Down’s syndrome is caused by a chromosomal abnormality (an extra chromosome 21), the most common chromosomal disorder. Big