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A 3-month-old infant with atypical Kawasaki disease. We report a 3-month-old girl who presented with high-grade fever for 3 days. Her initial physical examination was normal. Investigation showed abnormal white cells in her urine. She was diagnosed with a urinary tract infection and received an antibiotic for 1 day. After that, she developed a generalised maculopapular rash over her body. An adverse drug reaction from the antibiotic was suspected, and the patient was referred to our hospital. On admission, she still had fever and was irritable. She was diagnosed with sepsis and given another broad-spectrum antibiotic for 2 days. However, her fever still persisted. An additional thorough physical examination showed redness of her BCG inoculation scar. Consequently, a diagnosis of Kawasaki disease (KD) was made. After she received intravenous immunoglobulin, her fever diminished straight away. This case highlights an unusual manifestation of KD in an uncommonly young age group.