What is the legal status of a fetus carried by the enslaved wife of an enemy combatant who converted?

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If the wife is pregnant by her husband at the time of her enslavement, the fetus cannot be enslaved and must be considered a free Muslim. This is supported by Shafi'i. The reasoning is that the fetus is presumed free and Muslim, thus it is impermissible to enslave it, just as if the child had already been born. This contrasts with body parts because the fetus cannot possess a ruling separate from the original entity (the mother).