本文报道正常乳汁各阶段K~+(298例)、Na~+(291例)、Cl~-(299例)的含量(见表1),并作初步讨论。供乳者年龄23～32岁,平均为26岁。均以双侧乳汁喂养乳儿。乳汁来源,除初乳3～5天组在本院产科病房收集外,其余各组均由作者上门收取。乳汁 This article reports the contents of K ~ + (298 cases), Na ~ + (291 cases) and Cl ~ - (299 cases) in normal milk stages (Table 1). The age of the sufferers is 23 to 32 years, with an average of 26 years. Breast milk are fed on both sides of the milk. Source of milk, in addition to colostrum 3 to 5 days in our hospital maternity ward collection, the remaining groups were collected by the author. Milk