Twos and threes

 作者:娄诊刨     |      日期:2019-03-07 08:10:09
The US is experiencing a baby boom of twins, triplets and other multiple births. The National Center for Health Statistics near Washington DC has examined birth certificates from 1980 to 1997 and found that the number of twin births has grown by 52 per cent. Birth rates of triplets and larger multiples more than quadrupled,