In the Sims 2 Monique (from Insimenator.org) created a mod called 'Create Baby with X' (see link below). It allowed the player to choose 2 parents for a baby and mix their genes together before spawning a baby immediately without going through pregnancy. The new baby would appear directly in the Maxis crib.
I would like to see a similar mod for the Sims 3. It should be able to do all that the 'Create Baby with X' mod could do for the Sims 2 and then some. Like perhaps allowing the player to just randomize the spawned baby's genes, but you would still have to choose 1 or 2 "parents" to have custody of the baby. In this way, it would be like the spawned baby was adopted out of the adoption pool, since the baby is not blood related to the parents. Also, I know this may be far-fetched and may not even be possible, but if there is some way to make it so that you could choose the gender of the spawned baby, that would be perfect! You couldn't do this in the Sims 2 with the 'Create Baby with X' mod or any other way.
Yeah, I know it sounds kind of like cheating, to use such a mod to have a baby at anytime without going through pregnancy, but my intention of using such a mod is to aid in setting up a new game with a family that has one or more babies already in the game, especially since you can't create a new baby in CAS (but it would be nice if you could!

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Thank you for your time and attention!
http://www.insimenator.org/showthread.php?t=62111