He is a bit old to be so windy. I see this quite often in young children with a lactose intolerance. Try him off all dairy for at least 3 days and see if there is a real improvement. He can use soya instead of milk.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.