《颜氏家训·教子篇》
古时候的圣王，有所谓 胎教 的做法，妃后怀孕三个月的时候，就要住到专门的宫殿，不看不该看的东西，不听不该听的声音，平时吃的跟听的音乐，都要按照礼义加以节制。
古者，圣王有胎教之法：怀子三月，出居别宫，目不邪视，耳不妄听，音声滋味，以礼节之。
The ancient sages practiced prenatal education. When the royal concubine was three months into her pregnancy, she would move into a special palace, refraining from improper sights and sounds. Her diet and music were all regulated by ritual propriety.