《论衡·卷二十六·实知篇》
回答说：黄帝生下来能说话，然而他的母亲怀他二十五个月才生下他来，计算这个月数，他也已经有两年在他母亲的身体中了。
曰：黄帝生而言，然而母怀之二十月生，计其月数，亦已二岁在母身中矣。
The answer said: Huangdi was born able to speak, yet his mother was pregnant with him for twenty-five months before giving birth to him. Counting this month, he had already been in his mother's body for two years.