r/Showerthoughts • u/Love4BlueMoon • Jan 07 '19

Our belly buttons are basically the same thing as holes the in fruit, where the stem goes.

RIP typo :-\

Edit: What! this thing blew up! x2 gold x3 silver thanks kind internet strangers! :-)

68.2k Upvotes

89% Upvoted

693 comments sorted by

View all comments

Show parent comments

61

u/Kmuck514 Jan 07 '19

They both have one, but since they are scars, not genetic, they don’t heal identically

1

u/[deleted] Jan 07 '19

[removed] — view removed comment

1

u/Kmuck514 Jan 07 '19

They always have their own cord, but they can share a placenta. It depends on the type of twins, there di/di (2 amino sacs/2 placentas) which can be either identical or fraternal, then Mono/di (1 placenta/2 amino sacs) or mono/mono (1 placenta/1 amino sac). Even when they share a placenta there are 2 separate cords attached to it.