Why does a pregnant woman look as though she is using the bathroom when she is only giving birth?

Just so We all understand my question, and no it is not a serious question, I sm talking about the position, not the action, meaning I know that sometimes when a woman gives girth things like this tind to happen, so I take this out and just leave the position, if we don't mind, Again not a serious question.
Update: Just an amusing something my mom told me when I was younger and saw both TV and YouTube, the woman always looks as though she is going to take a huge dump, but she is only giving birth.
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