Thanks for putting up your query at HealthCareMagic. Had you mentioned the weight of the child, the temperatures recorded, the nature of fever and whether he is having associated symptoms like cough , it would have been easier for me to commentt. Most commonly such fevers are due to viral cause which are not relieved on treatment with antibiotics. These are self correcting conditions that automatically resolve in a few days. Bactoclav is same as Bactoclav D Syrup and contains Amoxycillin+Clavulanic Acid. However, it could also due to typhoid or certain other reasons and might need to get investigated. Please consult your pediatrician about this. I hope that helps. Feel free to contact back with further queries if any.