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1.
When a person is born with their Sternum protuding out of their chest. This person may be commonly asked if there is something in their shirt or under it, no there isn't. This does not effect the perons health at all.
They are just like every other person
It is a common thing is people
"Whats wrong with that guys chest"

"O he is Pigeon chested"
by Gary Pillion January 16, 2007