Alia is born partway through the first Dune novel. Her mother, Lady Jessica, is already pregnant when House Atreides arrives on Arrakis, but this isn't revealed until after Jessica and Paul flee ...

The Dune movies introduced fans to Leto Atreides, the father of the movie's protagonist, but there was another Leto who was ...

it's possible she'll replace Paul as the head of the Atreides family, and the universe itself. Considering Alia is still in the womb in "Part Two," there would need to be a time jump for "Part ...