Need more details. Where is the pain located? Above belly button? To the right? To the left? Near pubic bone? Is it sharp, or dull? 1 to 10 scale w/ 10 being unbearable. How often does it come & go? Are movements regular? Was he eating or doing something unusual right before it started? Any emotional trauma around that time?
Take a good picture of his irises & post them. Need more info.