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Belly Button Types: What Determines the Shape and Size? - Healthline
Navel - Wikipedia
What Causes an Innie or Outie Belly Button? - Healthline
5 Things You Didn’t Know About Your Belly Button
12 Facts About Belly Buttons - Mental Floss
What is the belly button and does it serve any purpose? - ZME …
Innies, outies and omphalophobia: 7 navel-gazing questions ... - UMBC:
Everything You Need to Know About Belly Buttons
Understanding Your Belly Button: Anatomy, Types, Infections - MedicineNet
Dirty Belly Button: Why and How to Clean Your Navel - Healthline