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Britain's Catherine, Duchess of Cambridge, visits Turner Contemporary in Margate, southern England, in this file photo taken March 11, 2015. Image Credit: REUTERS

The Duchess of Cambridge is as many as four days overdue with her second child, raising the possibility that her labour may be induced in the next week.

Several reports have suggested that the Duchess’s due date was on Saturday, but Whitehall sources have told The Daily Telegraph they were briefed that the due date was actually Thursday, April 23.

The Duchess may already have discussed the option of being induced with her doctors, particularly if she is becoming uncomfortable. Doctors at the Lindo Wing, the private maternity ward at St Mary’s Hospital, Paddington, where the Duchess will give birth, may already have carried out a scan to make sure the baby is thriving. If everything is normal, they could wait up to two weeks after the due date to induce the Duchess, but it may happen sooner.

A source whose children were born at the Lindo Wing said: “The doctors don’t normally wait for more than a week.

“They will probably already have been in touch with Kate and talked about which day would suit her best to go in and be induced if the baby doesn’t arrive in the next couple of days.”

Prince George was reported to have arrived three days late, and anyone who bet money on an early birth this time around has already lost their stake.

Pat O’Brien, a consultant obstetrician and spokesman for the Royal College of Obstetricians and Gynaecologists, said inducing labour was “a very safe procedure” offered to mothers if they are feeling anxious, fed up or uncomfortable once they have passed their due date. He said: “It’s down to the individual consultant as to when it’s appropriate to induce labour, but because it’s such a safe procedure, particularly with women who have given birth before, they tend to be pretty relaxed.”

He added: “Most mothers are getting pretty fed up once they go a week past their due date.”

Only three per cent of babies arrive on their due date, with two thirds of first babies arriving late and two thirds of second babies arriving early. Most women who are induced will only need to be given a hormone gel, applied internally to mimic the hormone prostaglandin, which is released naturally during labour. If that does not work, another hormone called oxytocin can be drip-fed.