I sometimes even decide the skin colour that way, in case of the parents are of two different races. When the (dark skin) father died, I rather see at least one baby with the father's skin.  I might take 10 or 20 tries, but it works.
The baby's gender and colour is randomly detemined at the end of the birth cinematic.

Ps. My neighbourhood is 95% girls, included NPCs. I don't notice and diference when babies are born.

Sims 2 works very well without that file. Have you tried to shut down your computer, when the error message comes, and see if it works on restart

Don't worry about it. It is still a great piece of art, and we are lucky you want to share it with us :angel:

I ran the file twice. It doesn't show up. I don't think it works with seasons.

It's not for me. I am not technical at all, but the size of your monitor should not really matter. It's more the kind of graphic driver, computer and graphic card people need. Maybe someone can help you.

Computers can be so stupid sometimes

you might need to give more technical imformation. I don't think Sims 2 is 100% compatible with all graphic cards.
Maybe you should try playing it in a window, not entirely full screen.

My game is doing fine without it. What exactly does it do?

Yes, in a normal game only men get pregnant by alien abduction.

Try this one: http://www.insimenator.org/showthread.php?t=46391

yes, I had that too. After installing the patch, it just didn't read the disk anymore. I gave up an and are now playing a patchfree game.
Patches, downloads and upgrades are dangerous for big neighbourhoods. On top of that I lost all my saved games as well, making me start from scratch for the millionth time. The bugs are really minor. My sims do fine as they are now.
I know I am hooked, but at a certain moment a person just has to stop improving the game.

To me it looks like you have "boolprop testingcheatsenabled true" enabled, or some program that does that for you.
Try going into a test lot and type "boolprop testingcheatsenabled false" in the cheat window. Than try playtesting that lot for a while, see if  the problem stops. If it stops, you should be able to play the other lots from than on. The boolprop testingcheatsenabled should never be enabled all the time. It conflicts with actual gameplay.

I take my sims very serious. Sometimes I get so angry because of their stupidity, that I run away from the game.

How many times doesn't it happen that just before the bus comes to get the kid to school, it throws a new quarter in the arcade. I can live with that, because they are kids right?

What I really really really hate is when a neighbour comes to vist but refused to accept to be welcomed, because there suddenly is some fluff on her shoulder. On top of that the greeting sim completely forgets why she is out in the freezing cold and just stand staring into a blank.

You just can't order a sim and go to an other part of the house. They will use the slightest excuse to completely forget what they were supposed to do.