It is almost certain that your son is lactose intolerant. He has the classic symtoms.You should have him tested for lactose intolerance. There is no hurry to change to another form of formula at 9 months. Let me know what the outcome of the test is and I will advise you further.
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.