Prince Harry and Meghan Markle's baby will automatically have the prestigious title of... Prince Harry and Meghan Markle's baby . But when it comes to its royal title, things can be complicated. Harry and Meghan took on the roles of Duke and Duchess of Sussex when they tied the knot last year but, when the bun is officially out of the oven, the rules put in place by Queen Elizabeth in the 2013 Succession to the Crown Act will dictate whether or not their baby is named as a prince or princess honorific.