I have been zapping my son- almost 15 months old on the 7 20 7 20 7 deal a couple times a week just to try and get a head start on parasites. I asked someone on a website about zapping small children, and she's known of people zapping at 8 months and up with no problems. It may be worth a try??? I feel so sorry for your little one! I hope you find out what is wrong, and get rid of it- FAST! Good luck to you!