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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.I am sorry for his symptoms.Hydrogen peroxide can cause irritation, inflammation of middle ear.So he felt the pain, discomfort with it.As he is settled now & sleeping, the effect was not too severe.You can observe.If you feel his hearing is affected, I would advise to get him checked by ENT doctor.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish him healthy life.Regards.