Appointment & sick baby

My 5 month old has an appointment out of town, it is a 2 hour flight. They marked it as “urgent” with an oncologist/haematologist.

However, my baby is sick. He has a runny nose, fevers & a bad cough. Would you rebook it or take him anyway? He’s been sick for 2 days now but it’s worse tonight… we are supposed to fly out at 4pm tomorrow.