You can't make baby animals. You have to let them spawn normally. If your world was created in a version older than 0.6.0 then no baby animals for you. Meaning if the world has to be created in 0.6.0 or newer for baby animals to spawn.
you have to cyt
no
Single player commands are needed.
You get a mod, such a Single Player Commands.
well minecraft 1.2.3 single player is beta so there are no commands hopefully in the next version
Yeah for a mod that spawns animals anywhere try SPC (Single Player Commands).
you can install Single Player Commands and there is a freecam option.
Use //set cobblestone.
do /clear inventory or just /clear
In multiplayer, commands are generally started with a "/" Single player commands have not yet been added, unless you get a mod that has commands, like WorldEdit. They will be added in the next update, 1.3.
Try a mod. You could use InvEdit or SPC (Single Player Commands).
Have you installed ModLoader and/or deleted the META-INF folder in the minecraft.jar.