Septicemia is a serious condition where bacteria enter the bloodstream and spread infection throughout the body. In newborns, symptoms can include fever or low temperature, poor feeding, excessive sleepiness, breathing difficulty, irritability, vomiting, or changes in skin colour. Since your 7-day-old baby has been diagnosed, this is a medical emergency and requires immediate hospital care. Follow the doctor's advice strictly, ensure the baby receives all prescribed antibiotics, and monitor feeding and activity closely. Do not delay treatment, as early and proper care is very important for recovery.