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@Elprincipe.

The change from a bunch of cells to a person is not an instantaneous thing like you are making it out we are saying. In the same way as when a tadpole changes into a frog there is no instant where it changes but rather a process over which it slowly changes.
A reasonable conclusion is that a fetus is a person when it is viable without being inside its mothers womb, once again there is no clearly defined point at which this is the case however it is usually accepted that a child born before around the 24th week of pregnancy is unlikely to survive.