50 days baby has a fever continuously 4 days 37 degrees 7 how to do

At present, this situation is likely to be caused by infection, you can take the child to the hospital to do a blood routine to see, if it is viral infection, you can carry out antiviral treatment, if it is bacterial infection, you can also carry out antibacterial treatment, in addition to fever can take physical cooling measures, wipe the baby's body with warm water.