my baby is having fever from last 6days,by using medicine fever is reducing but after 4-5hrs again fever is coming fever is upto 103f,when she is having fever her head and stomach is full hot but her hands and feet are very cool ,she is full of tired and sleeping always and always crying,no any other symptoms,using antibiotic from yesterday,doing urine test also it is normal, why she is having fever upto this many days?