Why can’t I reschedule my child’s appointment? You may have exceeded the number of rescheduled appointments or missed your appointment beyond the valid period. Related articles How can I reschedule my child's appointment at the Specialist Clinic? I am unable to reschedule my child's immunisation to an earlier date. What should I do? Must parents/guardians accompany our child for the appointment at the Student Health Centre? My child has lost his/her referral letter. Can he/she attend the appointment with the Student Health Centre without the referral letter? Why can’t I reschedule my child’s appointment?