Just get both sims to relax in bed. then click on one of them and select "try for baby".
just use the cheat moveobjects on and then click on it and it should give you the option to delete it.
use the boolprop testingCheatsEnabled true cheat then hold shift while you click your sim, um the option should be there...i haven't played it in awhile
srry, this is only for PC but yes search sims 2 on cheathappens.com and then clck on the xbox version to see cheats.
make outs, aspirations, everyone's talking. just have everyone make out again and again i get roof raisers doing that lol. and make sure there's lots of food.