Q Why is one pupil bigger than the other in a 2 month old baby boy?
1 in 5 babies can born with different sized pupils without any underlying disorder. If other family members also have similar pupils, then the pupil size difference is possibly genetic and nothing to worry about. However, certain underlying conditions such as Homers disease, aneurysm, tumor, increased intracranial pressure, meningitis can cause a difference in pupillary size. If your baby does not have any other sign and symptom and he is healthy otherwise, then there is nothing to worry about. But our advise will be to get him examined once to rule out any underlying disease.