Hello this seems like a viral infection from the history, viral infection can cause high grade fever continue paracetamol. Monitor for oral intake is the child feeding well, passing urine 6 to 8 times a day. If baby is active in the interfebrile period its mostly viral fever. But if there is no oral intake and baby is inactive u shuld consult local pediatrician.
Next Steps
Monitor fever and urine output as i said earlier. And also look for cough or cold symptoms giving further clue to diagnosis.
Health Tips
If there is no feed intake and fever is not subsiding despite antipyretics do consult a pediatrician.