The official statement announcing Kate's pregnancy revealed that she is suffering from Hyperemesis Gravidarum, the extreme sickness she also had during her first pregnancy with Prince George, and is being treated by doctors at her Kensington Palace apartment.
"She is at home being looked after by the surgeon gynaecologist to the Queen, Alan Farthing [pictured right], and the surgeon gynaecologist to the royal household, Guy Thorpe-Beeston [pictured left]," a palace spokeswoman added.
Sir Setchell was the royal surgeon-gynaecologist for 18 years. He delayed his retirement to lead the delivery of Prince George at the Lindo Wing of St Mary's Hospital on July 22, 2013, but has now handed over the role to Alan Farthing.
Mr Farthing, 51, was engaged to Crime Watch presenter Jill Dando when she was murdered in 1999, five months before they were due to be married.
When he started working for the royal household in 2008, Mr Farthing became one of the youngest doctors to treat the royal family. The birth of Prince George was the first royal birth he assisted at.
He has opened his own Harley Street practice and works as a consultant at two London hospitals, Queen Charlotte's in Shepherd's Bush and St Mary's in Paddington - where father-to-be Prince William was born in 1982, under the care of Sir Setchell's predecessor, the late Sir George Pinker.
Obstetrician Mr Thorpe-Beeston has 18 years experience as a consultant and specialises in pre-natal diagnosis, deliveries and ultrasound. He works at London's private Portland Hospital and on Harley Street.
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