What causes children to be born with "cauliflower ear"?

Answers:   its just the way that they were developed in the womb
Usually can be the way he/she was born in the womb. In other cases Cauliflower ear or hematoma auris or perichondrial hematoma is a condition common among rugby players (particularly forwards), boxers, martial artists and wrestlers. If the external portion of the ear is constantly hit or bashed around, a blood clot may develop under the perichondrium. This separates the cartilage from the overlying perichondrium that is its source of nutrients, causing the cartilage to die. When this happens, the outer ear becomes permanently swollen and deformed, thus resembling a Cauliflower.

Headgear that protects the ears is worn in many martial sports to help prevent this condition.
I hear that this happens often in premie babies. Sometimes this does correct itself, though, but some times it requires minor surgery.
It may be birth trauma. It can heal if the trauma is not repeated. My brother-in-law took a lick on his ear from a piece of farm machinery and developed one. It resolved itself over time, but it took awhile. Ask your doctor about it if you are concerned. If it doesn't resolve and it troubles you; odds are, at some point, that cosmetic surgery could be used to diminish it's appearance.

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