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Can dizygotic fraternal twins be conceived a week apart?

April 26, 2017apart conceived dizygotic fraternal twins week

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Can dizygotic fraternal twins be conceived a week apart?

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While it is possible for non-identical (dizygotic/2-eggs) twins to be conceived apart (and by different fathers!), it’s generally not the case. An ultrasound showing twins differing in age by 3 days is not significant given the margin of error for ultrasound technology. Just like most adults are different sizes, so too are babies in utero owing to genetic and environmental factors.