Based on the Chinese Lunar calendar, the chart uses a combination of the mother's age at the time of conception and the month in which the baby is conceived to 'predict' whether the baby will be a boy or a girl.

Of course, you can just wait and ask about your baby's sex during your ultra-sound scan at 20 weeks - but even scans have been known to get it wrong.

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It lets buyers and sellers on the huge marketplace show status messages about a shop, make announcements, keep in touch with customers and offer customer service.

Owned by Shanghai-based online games and book publisher Shanda, Youni is a mobile commerce and messaging app that can be linked to a user's bank account to transfer small sums of money.

Mobile instant messaging has become a key battleground for control of China’s internet services market.

The country’s rapid growth in mobile internet usage and a smartphone user base exceeding 843 million has launched a new wave of smartphone mobile chat services that can be used to channel traffic to many other apps and websites.

As of the end of 2014, the Alibaba-backed app had 69 million MAUs, more than double what it had a year ago.

E-commerce giant Alibaba needed a chat app that lets its huge Taobao user base communicate with each other, and simply serving this function has made Wangxin one of the most popular in mainland China.Lisa Durbin is a mother of one son, Jack, and two daughters, Mia and Isla. "Lisa points out that the calendar is just a bit of fun, particularly for mums who decide not to find out their baby's sex but can't help playing the guessing game.She consulted the Chinese Pregnancy Calendar during each of her pregnancies. "I certainly didn't take any of those gender 'tests' seriously," she says.The mobile version had 576 million monthly active users as of the end of 2014, an increase of 33 per cent over a year earlier.Riding on the back on China’s mobile user base, it has remained a wildly popular platform for chatting, gaming and also shopping, though its growth is much slower than its stablemate We Chat.It has carved a niche position for itself in the Chinese mobile messaging market by allowing users to easily trade unused items, as well as buy personal loans and make donations through the app.