First, it is important to establish if the earlier attack of jaundice (probably viral hepatitis) had completely healed. This can be determined by blood tests (liver function tests). If indeed it had healed and also your history suggests that, then the current episode appears to be a fresh infection by another agent. If improvement is occurring, you should give it a total of about 7 days to settle down. If after this period the fever has not settled down completely, you will need to consult a pediatrician.