
Mandy, they had Paul kidnapped, or more precisely an unsuccessful kidnap attempt by Piter. It ended up with Mohiam(?) going Kianno on his ass.
Turns out dear Piter in DUNE is actually a ghola(or clone?) of this Piter.
I think she had already given birth and was lying exhausted when Piter came and took Paul(lol, no guards? no BG watching the KH all of a sudden?)
At least that's what I remember from one read 10 years ago.

They probably couldn't think of way to make their stupid drama on the heavily guarded Atreides home planet, so they made them go to Kaitain somehow(maybe Mohiam wanted to deliver Jessica's baby because it was so important etc? I don't remember).