It has become popular amongst politicians, entertainers and the British royal family.
The sex of the new royal baby will be a surprise to everyone, including the Duke and Duchess.
He acceded to the throne when he outlived his older brothers, George IV, who died without an heir, and Frederick, Duke of York.
The little prince or princess will either be an Aries or a Taurus.
Kate and William with the Princess of Cambridge in May 2015.
Will they hire a second nanny?
Kate and William with their children Charlotte and George.
But Maria could be given a helper - perhaps a fellow Norland nanny - as she cares for the three youngsters.
Kate is likely to take an extended period off to recover and nurse the latest addition to her family but is expected to attend Prince Harry and Meghan Markle's wedding on May 19.
Middleton is now pregnant with her third child, as she and husband Prince William are already parents to son Prince George and daughter Princess Charlotte. For those interested in being in the loop, the pattern of Kate's third birth will match the organization around Charlotte's arrival, rather than George's.
It is expected Kate will give birth around April 23 - as the hospital prepares for the hysteria from royal fans who are predicted to gather in vast crowds outside the famous wing.
Kate Middleton is due to give birth to her third royal baby this month in the private Lindo Wing at St Mary's Hospital Paddington. However, it's unknown at this point if George and Charlotte will join their new sibling for the pics.
However, that's not to say that Charlotte doesn't have quite a few years-possibly a lifetime-to wait until she will see her day as queen.
Kate is only 36 so has time to even out the numbers.
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