是的fetus使就形成了,以后只会减少。详见下面20 weeks: A fetus typically has 6–7

million eggs Birth: A newborn typically has 1–2 million eggs Puberty: A girl typically has 300,000–500,000 eggs。女性成熟的卵子一般400-500左右,因为每个月是随机从众多(这个随年龄减少十几到几十都有可能)选出一个能够成熟。