I like to think if I ABSOLUTELY had to give an in-universe reason, it’s down to the fact that Leia is Force-sensitive and can remember the strong emotions her mother experienced during childbirth etc.
That’s the BS excuse I’ve always heard.
For a split-second there, I thought you’d typed “B5” instead of “BS”. I was asking myself, “What does any of this have to do with Babylon 5?”