Fertilization age: Dating a pregnancy from the time of fertilization. 2 weeks earlier than the gestational age.
Fetal anomaly: Fetal malformation or abnormal development.
Fetal goiter: Enlargement of the thyroid in the fetus.
Since the exact time that the fertilization takes place can only be inferred, gestational age is most often used. This article will refer to gestational ages. These can be converted to post-fertilization ages, of course, ...
 See also: Trimester, Pregnant, First trimester, Pregnancy, Oxygen
  
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