Eli5: Difference in twin ages

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So I recently found out I’m having twins. Looking at test results from an ultrasound it says fetus A is 9wks and Fetus B is 8wks 4days. What causes them to be different in age? Does that mean they are fraternal twins?

In: Biology

4 Answers

Anonymous 0 Comments

They would be fraternal. Your ovaries released two eggs in the cycle and one was fertilized a few days after the first.

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