Labour is progressing normally for the Duchess of Cambridge, who has been admitted to hospital, Kensington Palace said.
The Duchess, who was overdue, is being looked after by consultant obstetrician Guy Thorpe-Beeston - the surgeon-gynaecologist to the household.
He will be joined in the delivery room by Alan Farthing, the Queen's surgeon-gynaecologist.
The Takasakiyama Natural Zoological Garden in Oita is now considering renaming Charlotte after complaints from the Japanese public.
Kensington Palace warning over 'harassment' around Sandringham where Kate and William are staying with princess Charlotte and prince George.
Naming the royal baby Charlotte Elizabeth Diana will be seen as a tribute to the Duke of Cambridge's father, mother and grandfather.