My daughter had to have ct scans (3 in all) because of her sinuses. athey were done between age 2 1/2 and 3 1/2. She had to be sedated for 2 because she was so scared and would not stay still and could not be held still. I was a wreck. The last one she was scared but she cooperated. She is ok now. She is 4 1/2. I did just see a show either last night or the night before about ct scans and the radiation. I don't like the fact that my daughter got them but she really needed. Good luck to you.