The only real way to do it is with an elimination diet, and it's best to do that under the supervision of a dietician. good luck! It takes a lot of time and organisation to figure these things out
To start with keep a food diary and how he behaves on each day.
As MadB has suggested, elimination diets are tricky and you really should see a dietitian. Talk to your GP as you may also be eligible for a Care Plan under the Medicare system which can include a Dietitian, psychologist, OT and other allied health professionals.
A paediatric allergist would require a referral from a GP.
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