According to Chinese genesis, the goddess with snake body (2852-2738 B.C.) created chicken on the first day of the first lunar month, dog on the 2nd day, sheep on the 3rd day, pig on the 4th day, cow on the 5th day, horse on the 6th and human on the 7th day.
The goddess made many human using mud mixed by yellow soil and water. Also she taught human about the marriage; so human can reproduce themselves. Therefore, the 7th lunar day of the year becomes the human's birthday.
Almost no Chinese celebrate on this day. Some people just eat pettitoes with angel hair noodle. The long noodle stands for longevity. Once, Chinese ate seven vegetables (celery, shepherd's purse spinach, green onion, garlic, mugwort and colewort) on the human day, which can repel the evil spirits and sickness away.