Ginger can dispel cold and dampness, promote qi and promote blood circulation. People believe that pregnant women inhale a lot of "wind" during childbirth, and they must borrow old ginger to dispel it. Adding some sweet vinegar to the pig's feet is to melt the calcium in the pig's feet with black vinegar, which can be supplemented by pregnant women after drinking. Cooked old ginger is thin but not spicy, pig's feet are thin but not greasy, and black vinegar is sweet but not sour, so it is not only loved by pregnant women, but also loved by men and young people. Especially when it is cold in winter and cold in spring, it can invigorate qi and activate collaterals, dispel cold and wind, wake up the stomach and taste delicious.