Mum-to-be Meghan Markle was due to give birth on Sunday UK time, The Sun has revealed.
She and the Duke of Sussex are on standby but relaxed about the arrival of baby Sussex with Harry, 34, attending London Marathon on Sunday to hand out medals and support runners.
Meghan, 37, has been staying close to home. Her mum, Doria Ragland, has been at Frogmore Cottage, Windsor, for more than a week.
A royal source said: “It has been long now. Meghan's really excited. Of course she 's nervous like any first – time mum but she can.
She 's been preparing for birth – she wants to be as natural as possible – and has been practicing hypnobirthing and breathing techniques with Harry.
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"It 's been a huge support having her mum and she' s just getting as much rest as she can."
The Sun understands that Meghan wants to stay at home for as long as possible once she goes to work, but she understands that the safest environment is a hospital.
Frimley Park Hospital in Surrey has been on standby – only 30 minutes from their Windsor home.
The source added: “The plan has never changed, Meghan has been very clear what she wants. She is taking medical advice daily and she is very flexible and will be guided by their team.
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"When she goes to work, she wants to stay at home for as long as possible but she is in a situation where she did go wrong and she was a whisked to hospital, she would be.
“There were some ridiculous things about her birth plan.
“Yes, she would like a female-led delivery, but the suggestion that the Queen's doctors have been banned is just not true.
"Alan Farthing and Guy Thorpe-Beeston are involved in the planning and in the team as well as just how they all go."
The couple have always insisted publicly they do not know if they are having a boy or a girl. But Meghan reported her pals at her New York baby shower she was having a boy.
The baby is set to become the biggest Instagram star to date.
Experts believe the first image of the newborn will be posted on the picture sharing site after the couple recently set up an account.
This story appeared in The Sun and was republished with permission