This prospective study was conducted on 111 children with brucellosis, who attended the Department of Infectious Diseases, Babol, Iran, from September 1999 to March 2003. Fever (73.9%), sweating (67.6%), artheralgia (49.5%) and splenomegaly (18%) were common findings. The disease was acute and sub-acute in 97.3% and chronic in 2.7% of cases. Peripheral arthritis was seen in 35 (31.5%) of cases, which was monoarticular in 29 patients, most involving the knees and hips. Sacroilitis was seen in six (5.4%) cases.