There is a way to delete sims on The Sims 3, but i don't know how to do that. What I do know is that if you leave the baby till it becomes really lonely, and then eventually a social worker will take it away. Then you can never have the child back. :)
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In the sims 3 it is impossible to kill a baby.
You hit "Ctrl-Shift-C " then type in "BoolProp testingcheatsenabled true" then right-click the baby, then "Force Error" then "Delete"
I don't know about sims 3 mobile but in sims 3 you bring up the cheat box (CTRL+Shift+C) and type in testingcheatsenabled true. Then hold shift and click on the sim you want to delete, and it will say "Objects...". Click on that and from that menu select Delete it.
You can only delete custom content. Open The Sims 3 Launcher, find and select the item(s) you want to remove. Then, click on 'Uninstall'.
well, you can only have one baby in sims 3 but you van adopt some