I just want to support what Michelle has told you since I have a daughter who's been on mtx for 6 years and it has taken JRA under control. Now she's off mtx and on Enbrel feeling great!!!
Don't be scared, Jackie, children react far better than adults to this kind of med!
Hugs from Italy,
Antonietta and Elsa (almost 10 yo, dx poly at 18 months)