英准妈妈们上传b超照片猜宝宝性别
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.
A further fifth put pictures on parenting sites asking for others' opinions.
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.
The theory, used by one in ten, says if the baby's nub points up by 30 degrees or more it is a boy.
If it is less than 30 degrees it's a girl, with seven out of ten claiming the technique accurately predicted their baby's sex.
Meanwhile, six per cent said they tried the 'skull theory', with a square skull and jaw said to be a baby boy and a rounder skull a girl.
But seven out of ten expectant mums use the more traditional method to guess the sex of their baby by the shape of their bump.
If it is wider it is said to predict a girl, but if the bump protrudes more it could be a boy.
A third analysed their food cravings and half even tried to predict the gender by how sick they felt.
More unusual methods included a twelfth who looked at the size and shape of their breasts, and a fifth who used a Chinese Gender Calculator to guess the sex using conception date and the mother's age.