You can't. The only time to choose your gender is at the beginning when you are making you character. You can also start a new load if you want to.
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You cant, however you can on Sims Castaway life stories, when 2 sims of opposite gender are lying in bed, (given your reputation is high enough) select "Make a baby".
There's no game sims castaway, just sims casaway 2.
NO the sims castaway people cant have children on the wii. You can have children on the Sims 2 Castaway for pc.
no you can not have a baby on the sims 2 castaway on ds or ps2 or psp only on sims castaway stories for PC
the sims 2 castaway is like the sims 2 just your stuck on an island and you ethier live there or try your best to get back home. P.S. sims on PC = sims castaway stories sims on anything else= sims 2 castaway