In the homes of workers, rich families or officials in ancient times, one or two wet nurses were usually prepared at home after having a newborn. Many women who have given birth to children are reluctant to breast-feed their children themselves, because if they breast-feed, it may affect their rivalry for favor, and the smell of milk will always haunt them, so it may be difficult for her to compete for goodwill. In the past, children were generally breast-fed.
Of course, royalty is indispensable. Wang is an ordinary woman who gave birth to a daughter. Later, she was called Wang because she married a Wang Cairen. After becoming a wet nurse, she can get two taels of salary a month, but what she has to bear is that she can't see her children.
After all, I am afraid that she is not honorable enough to breast-feed her children and eat the same breast milk. For the better nutrition of milk, all the foods that the wet nurse wants to eat should not be salted, and other condiments can be less. This is actually mentioned in the palace costume drama "Empress". Eating too much salt will reduce the milk, which may not be enough for children. It can be said that it is very important for normal people to eat a tasteless elbow.