An expert weighs in on the likely contenders.

The pregnant wife of Britain's Prince Harry, Meghan, the Duchess of Sussex, will cut back her busy schedule as the royal couple enter the last week-and-a-half of their tour to Australia, New Zealand and the South Pacific.

Prince Harry and his wife Meghan Markle are expecting their first child in the spring of 2019, around a year after their glittering wedding injected Hollywood glamour into the British royal family.