I might have said this before, but I'd love it if children inherited traits no matter what. Total randomization is fun and all, and sometimes it's nice to choose traits, too, but it would be much more realistic if that virtuoso or that hot temper were inherited. The only way to do that currently is to make your sim have an awful pregnancy. That's not something that happens much in my game anymore. I wish the game would choose traits for the baby, with both inheritance and randomness playing some role, and if your sim had a terrific pregnancy you could choose to change the pre-selected traits or leave them, if that's what you wanted.