Is the mammalian embryo/fetus a part of the organism that gestates it? According to the containment view, the fetus is not a part of, but merely contained within or surrounded by, the gestating organism. According to the parthood view, the fetus is a part of the gestating organism. This paper proceeds in two stages. First, I argue that the containment view is the received view; that it is generally assumed without good reason; and that it needs substantial support if it is to be taken seriously. Second, I argue that the parthood view derives considerable support from a range of biological and physiological considerations. I tentatively conclude in favour of the parthood view, and end by identifying some of the interesting further questions it raises.

中文翻译：

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你是你母亲的一部分吗？

哺乳动物胚胎/胎儿是孕育它的有机体的一部分吗？根据包含观点，胎儿不是妊娠机体的一部分，而只是包含在妊娠机体内或被妊娠机体包围。根据分身论，胎儿是妊娠机体的一部分。本文分两个阶段进行。首先，我认为包含视图是接收视图；通常没有充分理由地假设；并且如果要认真对待它需要大量支持。其次，我认为分居的观点从一系列生物学和生理学考虑中得到了相当大的支持。我暂时得出了支持分居观点的结论，最后确定了它提出的一些有趣的进一步问题。