Not only are they more likely to be born prematurely and underweight, but there is also a greater risk that they will be stillborn or with a disability.

这些双胞胎出生时不仅更有可能发育不成熟及体重过轻，而且他们发生死产或残疾的风险也更大。

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The number of live born and stillborn piglets was not affected by feed composition during lactation or by feeding level during gestation.

哺乳期的日粮组成及妊娠期的饲喂水平对下一胎产活仔、死胎数均没有影响。

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However, research by Dr Louise Parker of the Royal Victoria Infirmary in Newcastle, published last year, suggested that workers at the Sellafield nuclear reprocessing plant in Cumbria had higher than average chances of fathering a stillborn child, or one born with defects.

BBC: Nuclear birth fears eased

According to Stillbirth and Neonatal Death charity, Sands, more than 4, 000 babies are stillborn - born dead after 24 completed weeks of pregnancy or more - in the UK annually.

BBC: Baby death support unit opens in Salisbury hospital