You can. Just go to the related links for more information.
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that is one of the downfalls of the sims 3, ugly maternity clothing. your sims can't change their maternity clothing.. it is unfortunate
You can't change it
I don't think there is because female Sims and male Sims have different clothing and it wouldn't work.
In the sims 3 it is impossible to kill a baby.
You can't change your sims height..