In pigs where you have multiple births, you could have crowding or some other issue that creates the defect [later on].

猪是多胞胎，它们可能会相互拥挤或者有其他的一些问题，造成了这些缺陷。

youdao

In other news, the first report on the number of American births in twenty-ten shows another decrease.

在其它新闻方面，首份关于2010年美国出生率的报告显示出生率再次下降。

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Dallas has the highest rate of repeat teenage births in the country, 28%, according to a September report from Child Trends, and several other Texas cities are in the top ten.

根据《儿童趋势》九月份的报告，达拉斯地区以28%的青少年再次生育率位居全国第一，而德克萨斯州其他的几个城市也名列前十。

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In other births, emotional or mental tension increases slowly as the woman's labor progresses.

VOA: special.2009.11.24

The story with the birth rate is not quite as dramatic, but considering that Russia underwent a nasty recession in 2008-09 the fact that births did not decrease (as they did in most other East European countries) should be taken as a positive.

FORBES: Connect

From Angelina Jolie's adoptions to Britney Spears and other celebrity births, babies are the new in-crowd.

FORBES: Magazine Article

Other factors contributing to the high increase in the number of Caesarean births included the size of the hospital, the availability of a neo-natal intensive care unit and the number of midwives on duty.

BBC: Huge rise in Caesarean births