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Navel - Wikipedia
I’ve always wondered: what’s behind the belly button?
Belly Button Types: What Determines the Shape and Size? - Healthline
Why Do Belly Buttons Leak Fluid (Discharge)? - Verywell Health
Navel Definition & Meaning - Merriam-Webster
What Purpose Does the Belly Button Serve? | Mental Floss
NAVEL | English meaning - Cambridge Dictionary
Navel | anatomy | Britannica
NAVEL | definition in the Cambridge English Dictionary
Pregnant Belly Button - Healthline