According to old rules of noble titles, Beatrice, despite being the eldest York child, cannot inherit her father’s dukedom because she is a woman.
Duchess titles are only given to those who marry a Duke, so Princess Beatrice will never become Duchess of York like her mother, Sarah.
That means the title is likely to instead go to young Prince Louis, two, instead.
Prince Louis is the second child of Prince William and Kate, Duchess of Cambridge.