"Unless there are two doctors lifting the babies out simultaneously, one will be first," Ingrid Seward, editor of Majesty magazine, told the Daily Mail Online. "I expect the twin who isn't out first would have more fun - they'd be the Prince Harry...That's why it's hereditary. It's a job, a duty - you don't do it by choice, it wouldn't work. One twin has to be there first – and you can't argue with that."
Last year in Denmark, Prince Vincent was born 25 minutes before his twin sister, earning him a higher place in the line of succession.
Photo: Kate Middleton in October/Credit: Corbis