The purpose of this study is to evaluate the safety and efficacy of three doses of valsartan (0.25, 1.0, and 4.0 mg/kg) on mean sitting systolic blood pressure (MSSBP) and mean sitting diastolic blood pressure (MSDBP) in 6 months - 5 year old children with hypertension (sitting systolic blood pressure [SSBP] ≥ 95th percentile ).