Anna
I am so sorry that such a young child is afflicted with such a painful problem. I have had it for years, but it is in association with Ankylosing Spondylitis. Heat and aspirin is what I take, but with such a young child you have to check with your doctor. It can come after having severe bronchitis.I can have it for weeks and then it disappears for a while and then comes back. He should not be lifting and pulling as that makes it worse. Good luck.