It can be healed naturally, but you would need to find a way to reduce the hernia effectively and maintain the reduction so that you could apply a fomentation to it.
I don't think they make trusses for 4mo olds but who knows, something creative can always be made. The fomentation would be soaked in a very special tissue building herb formula (Bone, Flesh, and Cartilage) developed by the late Dr. John R. Christopher. There's some information out on the web, or email me for the specifics.