I was very surprised to see the element of rats in the home, needed to bring in the element of RAT POISON, which becomes necessary, just as Q must always demonstrate the weapons & gadgets that 007 will eventually use later in the film. So the audience knows about the rat poison in the kitchen cabinet, & I, for one was at that point predicting the later events in the film. bad things happen, When the wife and kids go to her mother's after the birth, the maid through her wiles seduces the husband, and becomes pregnant.
Mom returns home, dad, feeling guilty, confesses, .... mom convinces the maid to abort by falling down the stairs. But the maid now demands the death of mom's new baby. ...
the little boy, being convinced that he had swallowed rat poison, tumbled down the stairs, and died from the fall. Now the man is rather angry at the housemaid.
...
dad & maid both decide to take poison, but dad wants to dies in his wife's arms, maid will not let this happen...
& now (as the Pythons would say) for something completely different:
none of those awful events ever happened. The parents had been discussing an article the newspaper about men being seduced as the film began, & here is the end, all is well, & papa breaks the 4th wall with a warning to all men. Don't let that happen to you!