| There are tests that can be done to look for Down syndrome during pregnancy. 有些测试可以用来在孕育期就查证出唐氏综合症。 The risk of having a baby with Down syndrome increases with the mother's age. 产下唐氏综合症婴儿的风险会随着母亲年龄的增加而增加。 The rate is one in every one thousand two hundred births at age twenty-five. 这一几率在（母亲）25岁生育时是1/1200。 At thirty-five it rises to one in three hundred fifty births. 在35岁时，增长到1/350。 And at forty-five the rate is one in thirty. 在45岁时，这一比例是1/30. |
