最初由 kliu 发布
Many articles say that there are a lot more twins or multiple births now because women are bearing baby at older age.
There's also government statistic showing that people who born children after 40 has 1000% more chance to have multiple births because the woman's body will produce more than one egg since it knows that the chance of fertizing the egg is less as the woman is older.
http://www.cdc.gov/nchs/pressroom/99facts/multiple.htm