I dont think there is a way to erase data but you can create other sims and save them in the file of a sim you dont want anymore
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If by reset you mean delete your data files then once logged in you simply go to options and then click on erase personal data.
The mystic cowbell on sims 2 for nintendo ds is a special type of items that has never been used in the Sims franchise before. It is an item that allows the holder to be immortal.
You can't woohoo on the sims 3 for the nintendo ds. It is rated e for everyone so it is too inappropriate for younger audiences. You can woohoo on the pc version of the sims 3 though.
yes you can have babies
the data is not stored in the ds but on the game card