Shiva. In babies who are less than 6 months old, passing stool once in 3-4 days is normal. It is considered normal even if they pass stoll once in 5-6 days. The fever
however, is an unrelated problem and needs to be seen by a pediatrician
. I see an expereinced pediatrician on this site - http://www.healthcaremagic.com/superspecialists/Pediatrician/31 . You may want to talk to him over phone for his opinion.