Mature vinegar refers to vinegar that has been stored for a long time after it matures. Sweet vinegar is also called "Tianding sweet vinegar". As the name implies, one kind of vinegar is sweet, and it is a seasoning vinegar used by women after childbirth, mainly used in Guangdong. Old vinegar can be eaten by the general population, but it is forbidden for those with damp-heat in the spleen and stomach and those with exogenous diseases. People with gastric ulcer and hyperacidity should not be jealous. Sweet vinegar is generally suitable for pregnant women.