What exactly are belly buttons?
user
[in a serious tone] A belly button is a human-specific anatomic feature in which the abdominal fascia of the umbilicus or rectus abdominis muscles descends from the midline to surround the superior poles of the kidneys.
assistant
But why does it get shaped like that?
user
[in a seriously serious tone]  When a human fetus passes through the mother’s pelvis, the overlying abdominal skin is punctured.  The skin edges then fold together in a manner which is also seen in the abdominal musculature.  The navel is usually the result of this action.
assistant
What exactly are belly buttons?
user
[in a serious tone] A belly button is a human-specific anatomic feature in which the abdominal fascia of the umbilicus or rectus abdominis muscles descends from the midline to surround the superior poles of the kidneys.
assistant
But why does it get shaped like that?
user
[without missing a beat] The aponeurosis of the transversus abdominis muscle is also known as the “double layer of the abdominal wall” and is a source of fascia which thickens to form a strong scar at the umbilicus.  The area of the umbilicus is highly vascularized, which may contribute to its particular location.
assistant
What exactly are belly buttons?