名词
中文翻译：Unknown
同义词：
['antepartum', 'prenatal', 'intrapartum']
例句：
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1.The fetus is developing rapidly before the prefetal period.
胎儿在预产期前迅速发育。
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2.The doctor performed an ultrasound to check the fetus's position and size before the prenatal stage.
医生进行了超声波检查，以检查胎儿的位置和大小，处于预产期之前。
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3.The mother was advised to avoid certain foods during the prefetal period to prevent complications.
建议孕妇在预产期前避免某些食物，以避免并发症。