In primitive society, people were naked and semi-naked. When a woman reaches her menstrual period, she will be isolated to live in other places outside the tribe and come back when she is clean. Women don't have any scientific measures to deal with "big period", just looking for something like hay or leaves to wipe blood.
In feudal society, social productive forces were constantly improving, and people's quality was also improving. Women began to use "moon cloth" to prevent "big aunt" from leaking out. "Moon cloth" is also called "moon belt". This thing is not sold in the market. This is a unique stunt handed down from mother to daughter. This is handmade. Each family has its own characteristics, with different colors, lengths and sizes, but the basic structure is similar. The practice is to cut clean cloth into rectangular strips with a width of about 10cm, and some of them slightly widen the sides according to their own needs, similar to the side leakage protection wings of sanitary napkins today. There is a slender rope at each end of the "Moon Belt", and a rubber band or cloth belt is tied around the woman's waist, on which the rope of "Moon Belt" is tied. Open a small mouth in the middle of the "Moon Belt" and fill it with some plant ash. Plant ash has the functions of absorbing water, moisturizing and killing viruses. The "Moon Belt" can be reused. Just replace the plant ash inside, wash it with water and dry it in the sun, and prepare it for next use. Later, when some wealthy families washed the "lunar calendar", they added some alum to the water, which could play a role in sterilization and disinfection.
China is a country of civilization and etiquette, and its words are implicit. Nowadays, women can avoid embarrassment by calling sanitary napkins "bread". In ancient China, people also gave some nice names to "Moon Belt", such as "Cake Cinnabar" and "Wearing a Ring". Women are very careful when using and storing this thing, for fear that others will know. Some couples have lived together for decades, and their husbands still don't know what a "moonlight belt" is.
In the feudal society of more than two thousand years in China, when women come to menstruation, they always use "monthly belt" to prevent leakage. Although the times are changing, the "moon belt" has basically not changed much, but at most it has been improved in shape and cloth. In the 1940s, European and American sanitary napkins entered the China market, and "Moonlight Belt" gradually withdrew from the historical stage.
Unexpectedly, although sanitary napkins are women's products, its inventor is actually a man. It was invented by a man in America. This man loves his wife very much. In order to eliminate the troubles brought by his "big aunt", he studied hard and invented sanitary napkins. Soon, sanitary napkins became popular in Europe and America, and later spread all over the world.