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And the longer they are nursed the greater the protection, say scientists. The finding adds to previous studies suggesting mother's milk helps prevent sudden infant death syndrome SIDS. But the international study is the first to determine the duration needed. The finding by the University of Virginia adds to previous studies suggesting mother's milk helps prevent sudden infant death syndrome file image. In the US, about 3, babies died suddenly and unexpectedly in , the most recent year for which data is available.