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Results 1 - 1 of 1 for Conception age
  1. Is the probability of having twins determined by genetics?: MedlinePlus Genetics 
    ... of having DZ twins include the mother’s age, ethnic background, diet, body type, and number of other children. Assisted reproductive technologies such as in vitro fertilization (IVF) are also associated with an increased frequency ...
    https://medlineplus.gov/genetics/understanding/traits/twins - Genetics