次哺乳时乳汁成分的变化 The changes of the compositions during the sucking period g/L I Ⅱ Pro 11.8 9.4 7.1 Fat 17.1 27.7 55,1The changes of the compositions during the sucking period（g/L） I II III Pro 11.8 9.4 7.1 Fat 17.1 27.7 55.1 一次哺乳时乳汁成分的变化