Why is the Year of the Loong behind beginning of spring?

The first day of the first lunar month only refers to the beginning of this month of the lunar calendar, which is a "new moon", not the beginning of the lunar year, counting from the day of beginning of spring in the 24 solar terms. In other words, the beginning of the lunar year is not necessarily the beginning of the lunar month. The first day of the first month of this year is not the starting date of the birth of the dragon baby, but February 4 is the starting date of the non-Chen year.