We will test our hypotheses by using a pilot study, in which we will recruit 18 chronically ill children from our clinical practice. We will obtain medical records for each patient 12 months prior to starting the study. Those patients without pre-study medical records will be studied for 12 months prior to starting GH. If we can obtain 6 months of prior medical records, then the patients will be studied for 6 months before starting GH. Anything less than 6 months will be studied for the full 12 months prior to starting GH. Patients will receive treatment with GH (0.3 mg/kg/wk) for 12 months and their growth will be compared to the year before treatment. All subjects will be followed every three months for the entire study. We will measure height and weight using a standardized stadiometer and scale, respectively, every three months during the study. From these measurements we will calculate height and weight velocity and height and weight Z score. Lean body mass (LBM) will be measured by DEXA every six months. Utilizing the stable isotope 1-[13C] leucine, we will measure whole body protein turnover (WBPT). Measurements of WBPT will be correlated with LBM and changes in height and weight velocity. This data will be compared to that from age matched normal children (archival data maintained by the PI). We will measure IGF-1 and the cytokines TNF-α, IL-6 and IL 10 at baseline and very six months. We will evaluate GH effects on these levels.