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Pregnant women are taking the selfie craze to a new level by posting pictures of their 12-week scan online for friends to predict the sex. 英国准妈妈们让自拍热潮上升到了一个新高度，她们纷纷将自己怀孕12周的B超扫描照片发布到网上，让网友们猜测宝宝的性别。 A poll by parenting site Netmums found a third of parents had uploaded scans to social media sites like Twitter and Facebook for other users to guess whether their baby will be a boy or a girl. 育儿网站“妈妈网”（Netmums）的一项调查显示，三分之一的准父母们曾经在推特（Twitter）和脸谱网（Facebook）上传过B超扫描照片，并让网友们猜测是男孩还是女孩。 A further fifth put pictures on parenting sites asking for others' opinions. 有超过五分之一的家长会把照片放到育儿网站上以寻求他人的意见。 The fastest-growing scan analysis trend is the 'nub theory', which uses the 12-week scan picture to see what angle the nub - a small lump where the genitals will develop - is pointing. 发展最快的一种扫描分析方法叫做“小肿块理论”，它主要是看第12周B超扫描照片中宝宝身上小肿块的角度——这个小肿块所在的位置就是宝宝生殖器将发育的位置——以此来判断生男生女。 The theory, used by one in ten, says if the baby's nub points up by 30 degrees or more it is a boy. | 
