An 'innie' belly button

I was a weird kid – I used to be very jealous of people who were left-handed, and desperately wanted an outie belly button (I don’t know what was going on with me either).

Like 90% of people, though, I very much have an “innie”. I’d always known that belly buttons in general were a kind of “scar” caused by the removal of the umbilical cord; some people thought that how the cord was cut affected the shape of our navel.

Scientists have long known that’s not true, but now, some researchers think they’ve discovered a “sheath” that can explain the differences further.

So, why do innie belly buttons........

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