Oh bloody hell!

[Quinctia]

All RAM does is shake the Yahtzee cup faster, it doesn't increase the chances that you'll roll a Yahtzee.  You still get one roll for twins.

[Ellatrue]

I really think explanations are a lost cause, at this point.

[Kristalrose]

I run a PC, and I've had this happen.  Sometimes, it seems that every birth I have in the neighborhood is a boy.  Then, for a little while, all girls.  Then, a run of twins.  I don't think that it's because my PC hates me, or that it has too much RAM, or that I'm feeding my sims too much cheesecake.  I think that the game gets stuck on a certain type of birth, and it can be very difficult to break the streak.  One time, tired of having girl after girl, I saved my game right before the mom gave birth, and kept exiting to the neighborhood screen without saving.  After about the 6th or 7th little girl, I gave up.  Sometimes running the Lot Debugger before the birth will help.  It does keep the siblings from being identical.  Before the Lot Debugger, I'd have a whole bunch of Simmy-kids in the family with the same genetics and personalities.  Now, siblings are more realistic.  But, it doesn't always help break the "same birth cycle".