Recurrent fever. Days by paracetamol!

Sir my child age is 5 year old he is having recurrent fever from last 2-3 months like after every 15-20 day he is having fever like on 1 April he has fever which completely subside after paracetamol in 2-3 days but again after 20 days he had fever which also subside by antibiotic and paracetamol this type is repeating after every 15-20 days in last 2-3 months no other issue like i think no fatigue as child is completely active playing watching TV and all no heavy sweating only fever is occours this way every 15-20 days little weight loss also but I think weight loss because of child has started going to school since April so eating habits disturbed and going in sun exposure and hot weather but concern is after every 15-20 fever is coming coming for 2-3 days but completely subside after 2-3 days by paracetamol