You can't get a haircut in the first month. You can't cut your hair for the first month. The most popular one comes from a folk taboo: "My uncle died when I got a haircut in the first month". However, according to historians, this kind of folk taboo is a misinformation of folk culture and has no scientific basis at all.
The first month is the month of "building rights". In the era of observing the image, bucket handle belongs to Yin, and Zheng Chun's month is the first month. The establishment of the calendar was originally the concept of establishing the calendar in December. It has also been used to refer to the first month of other calendars. Now usually refers to the first month of the lunar calendar. In the summer calendar, January in spring is the first month, which is equivalent to the lunar month in the dry calendar.