welcom to HCM,
read your prob, how strange baby has been suffering from fever
since 40 days n ur consulting doc hasnt been able to find the cause of fever. causes of such fever may be UTI, SOME KIND OF ABSECES, TUBERCULOSIS
. U must get some investigations CBC, ESR, COMPLETE URINAL ANALYSIS, SONOGRAPHY
OF WHOLE ABDOMEN. MOST COMMON CAUSE OF SUCH FEVER IS UTI. So u should refer all these things to ur pediatrician
n start proper treatment.