Anak batuk & selsema

please check with doctor.. my son also same when we checked he had RSV pneumonia.. he needs to admit in NICU for 2 weeks..once he discharged he again had cough and flu.. we again bring to doctors..they said this was normal flu .we use nasal spray and suck the flu.. cough will go on it's own.. it could be because of the formula milk he consumed. some milk can case baby to HV cough and flu