Diagnosis in Kawasaki disease usually is made on the so called main symptoms and on laboratory findings. The analysis of three cases in the first six months of life demonstrated that the typical symptoms concerning the mucosa and the lymphatic nodes are rare in this age group, whereas drug resistant fever and polymorphic exanthema was present in all patients. Besides that accessory symptoms like abacterial meningitis and pathologic urine analysis seemed to be frequent signs. Laboratory findings such as pathologic blood sedimentation rate, elevated CRP and thrombocytosis on the other hand were helpful in making the diagnosis.