The unborn alien baby of Pascal Curious will be born shortly after starting to play the household. Pascal Curious was abducted by aliens before the game started, and he is on his third day of his pregnancy.
In The Sims 2 on PSP, the child was a boy, who was named Tycho. In the story, Tycho was kidnapped by Vidcund Curious to make experiments, just as his dad's friend, Nervous Subject.
Notes
In The Sims 2 on PC, unlike Brandi Broke (the only other pregnant, playable character in the base game), whose child is always a boy, Pascal's baby may be either male or female. There is no chance that twins will be born. The unborn baby will always have green skin and black hair. Without the use of cheats, the baby will most likey be a girl, although in The Sims 2 for PSP the baby is a boy. Most of the time it will have black eyes, but sometimes they might be dark blue like Pascal's.