Welcome Andrea. Sorry you have to join us but you are in good company.
Perhaps you could tell us some more about your son's diagnosis and situation. What tests did he have that led to his diagnosis? What have you been told about the severity of his disease and the location? For instance does he have ulcers, strictures, is there inflammation in the colon, TI (short for terminal ileum), etc.?
Are you in the US or Europe or ? Is he being treated by a doctor that specializes in treating pediatric IBD?
5 days is not very long to give the prednisone to work depending on the severity of your son's illness. Did he appear to have any improvement on the Modulen? How much?
Did your son's doctor give you any idea of his long term plan for your son? Is he still on the Modulen or did he let him go back on regular food?
Prednisone is not a cure or should not be used as a long term treatment of Crohn's. It suppresses the inflammation but at the cost of damage to the bones and sometimes to other body systems. For example it can cause diabetes and you must be very vigilant for signs of infection like fever, rashes or redness at sites of cuts, etc. since the normal signs of infection may not be present to the same degree as normal.
AS for exercise and such, I would encourage your son to keep to a normal routine to the extent he is able. But I would not push him too much. His body is very sick and you do not want him getting any sicker. It can be hard to know what to do but I would say you should trust your instincts and do what you think is best.
If you notice that doing the walk lifts his spirits then by all means do the walk. You may need to go super slow and pause a couple times. Or you may need to shorten it etc. If doing the walk seems to just exhaust him and make him feel really bad then perhaps you could find something else to do together - sit outside and play a game of cards or throw the ball for the dog or something.
Hugs. He will get better but it is probably going to take a while and the ride may be a bit bumpy at first.
