If I invite you into my airplane, I am entitled to kick you out.
I am not entitled to kick you out at 30,000 feet.
The baby is entitled to safe delivery because the mother has invited it aboard (and if the baby was the product of rape it's equivalent to a stowaway, who also should not be tossed overboard when there are nonlethal resolutions possible).
This is a classic though experiment. But I don't think the contract is as clear cut with a child as it is in the airplane example.
I think your example would be more fair if the guest jn the airplane was becoming violent and threatening to crash the airplane.
It's a variation of the "guy hanging on my flagpole" example. And in that example I think you do have the right to tell him to let go.
I don't think you are a good person for doing so and ultimately I think the social layer of justice (not sOcIaL jUsTiCeš¤£) can sort out extreme applications of the law
