dear user at begining i would like to tell you that throat infection is common problem of this age....you need not to get worry but you should follow simple steps for that.....first this constant fever is dangerous and should be lowered .....you used medications to lower fever and failed of that but simply you can do cold compresses for the baby for 10 minutes then give him antipyretic drops or 1.5 mm of antipyretic syrup and fever will relief....cold compresses simple and very effective for relief of fever but alot of people ignore or forget to do that....2nd detection and treatment of the cause is important as it may be due to bacterial infection and may need to have antibiotic syrup for treatment then if the cause treated improvement will occur rapidly....so you shouldnot get so worry about that and just follow these simple steps please..........with my wishes of healthy happy life for you and your baby