I have just given my son one measure (5mls) of nurofen for his slight fever we think he has just developed chickenpox today as he has a few spots all over his body. He is 3.5 years old, I had absolutely no idea you couldn’t give it to them and only realised after when I was Googling things to help him feel better. I’m now freaking out and feel awful. Can anyone offer advice? Should I be seriously worried?