 Breast milk volume and zinc concentration, and total zinc transfer from mothers to infants will be the major outcome variables, which will be examined for conformance to the normal distribution and transformed if required. Means of the major outcome variables will be compared for AGA and SGA infants for each time points, using repeated measures ANOVA. Repeated measures analysis of covariance will be used to assess if these relationships change with age. Analyses will be done with SAS Release 9 and SPSS version 10. 