"Noble Son..." joke

1st Friend: I have the perfect son.

2nd Friend: Does he smoke?

1st Friend: No, he doesn`t.

2nd Friend: Does he drink whiskey?

1st Friend: No, he doesn`t.

2nd Friend: Does he ever come home late?

1st Friend: No, he doesn`t.

2nd Friend: I guess you really do have the perfect son. How old is he?

1st Friend: He will be six months old next Wednesday.