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She’s set to welcome her third child in April.

And the Duchess of Cambridge has to follow a bizarre set of birthing rules in order to adhere to tradition.

The royal family has a set of customs they follow when any baby is born — including who the first person to be told the news is.

Other practices dictate who is allowed in the birthing room and how the birth is announced to the British public.

1. Home births are preferred
As is tradition, the Queen gave birth to all her children in Buckingham Palace.

Princess Diana broke this rule and gave birth to sons Prince William and Prince Harry at London’s St. Mary’s Hospital in the private Lindo Wing.

Kate had her first two children at this hospital, but is believed to be delivering her third baby at home in Kensington Palace.

2. The Queen has to be the first to know

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The Queen must be told a child has been born into the royal family before the news is announced publicly.

It’s reported that Prince William rang his grandmother on an encrypted phone when Prince George was born.

Traditionally, the announcement has always been on an easel outside Buckingham Palace.

Kate and William broke this protocol and announced it on Twitter with Prince George.

3. The town crier announces the news to the public

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Town crier Tony Appleton announced the births of both Prince George and Princess Charlotte.

This custom harks back to medieval times when people couldn’t read or write.

4. Dads are banned from the birthing room
Giving birth is considered a female-only event and fathers are not allowed in the delivery room.

This rule is believed to have been relaxed after the birth of Prince Charles.

5. Midwives are sworn to secrecy

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Midwives are not allowed to disclose any information about the birth.

It’s believed Kate Middleton had three midwives with her during the birth of Princess Charlotte.