Infant Feeding---Breast feeding Elements of breast milk in different phase colostrum: 0~5d protein transitional milk:(6-10d lipid mature milk: 11d-9m stable element late milk: >10m) proteinInfant Feeding---Breast feeding Elements of breast milk in different phase colostrum: protein transitional milk: lipid mature milk: stable elements late milk: protein 0~5d 6~10d 11d~9m >10m