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« Pectus carinatum (pigeon chest) is when part of your child's breastbone is pressed outwards or raised up. It usually first develops during a rapid growth spurt, in children and adolescents aged 10 and older »
It doesnt really look like in the yaoi. The pictures show the breast bone being pushed too foward. Technically looks like a pyramid instead of the between crack of the chest?
All these comments are saying to not google pigeon chest, so would someone please explain to me what pigeon chest is.