I would think that you certainly could give a one year old vegetable soup.  I would make sure that the vegetables are small enough that he can handle them without choking.  You also may want to puree the soup with an immersion blender which will ensure that there is no choking.  Using an immersion blender would be very helpful to accomplish this.  My daughter started feeding her son food from the table using this method and it worked really well. 

Paul Palumbo

http://phpalumbo.com