To determine the proportion of children receiving antibiotics for common illnesses and to understand the antibiotic prescription ptern and factors influencing it, a cross sectional study was done among the private practitioners in Chennai, India 403 prescriptions by 40 physicians from selected health facilities were analyzed 79.9% of children with ARI (Acute respiratory infection) and ADD (Acute watery diarrhea) were prescribed antibiotics. Penicillins (43.9%) were the commonest antibiotic prescribed. Factors like postgraduate qualification, experience of physician, source and method of updating knowledge, inpatient practice setting and presence of fever influenced the antibiotic prescription.