Welcome to the forum! But, I'm sorry that you've had to search us out.
Do pop into the parent's forum - there are supportive, knowledgeable members throughout the forum, however, the 'parents' can also offer the extra understanding that's sometimes needed when it's your child that is sick. :ghug:
Prednisone is typically used to reduce inflammation before beginning a maintenance medication. As far as if remicade can 'fail' - all drugs have the potential to fail and, as you learn more about crohns, you'll see that it is a very individual illness. What works for one person, may not work for another, the dosage or frequency varies from person to person, sometimes a combination of meds is needed, etc. Remicade has proven to be fairly successful and there are many member and kids using it. One thing to keep in mind is that most people who come to a forum are coming because they are having problems, etc., so don't be too alarmed if you read 'remicade isn't working for me' more than once, there are many, many thousands of people out there using remicade with no problems and they are likely not on a forum.
My son has been using remicade for almost a year now and he has not had any problems at all.
:ghug: