Singapore on Wednesday confirmed four new cases of the novel coronavirus, including a six-month-old boy who is the youngest person in the city state to have been diagnosed with the disease.In a statement, Singapore’s ministry of health confirmed three of the new cases were linked to a “cluster of local transmission” identified on Tuesday.The four new cases bring Singapore’s total number of cases to 28. All four of the people diagnosed were being held in isolation.Two of the new cases are father…