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Twin pregnancies produced a child with CP 12 times more often than singleton pregnancies.The heightened risk was largely related to the tendency of twins to be low in birth weight and to a greater risk of CP in twins of normal birth weight compared with singletons of similar weight. Twins of unlike-sex pairs,necessarily dizygotic,were not at lower risk than like-sex pairs.The current increase in multiple births is likely to contribute more children with CP. |
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