Боюсь рожать второй раз.

[tasha_ab]

Вот тут конкретно про синром Дауна:
1:1500 (or 0.06%) for women under 21 years.
1:1000 (or 0.1%) for women at 29 years of age.
1:300 (or 0.3%) for women at 36 years of age.
1:100 (or 1%) for women at 40 years of age.
1:30 (or 3.3%) for woman at 45 years of age.