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It's just an anomaly that shows up occasionally. It isn't as though there is any known cause, it's just part of the process. Most birth defects end up being a miscarriage. The woman's body identifies that there is a problem and the fetus is aborted. Some kinds of birth defects fool the womans body into thinking that everything is ok and the baby is carried to term.

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19y ago

What else can I help you with?