The gastrointestinal system is such an integral part of the human body. It is a complex system, and when some part of the gut is not working, your child will not feel well. They may have a gut condition like constipation, loose stools, reflux, coeliac disease, bloating or pain. This is especially important if your child is unable to tell you how they feel. Many children with autism are non-verbal and unable to let their parents know of their pain or discomfort.