Hi doctor, I am seeking your advice regarding my baby. I have noticed that when my baby opens his mouth wide, the black part of one eye (pupil) seems to move downward, while the other eye remains normal. At other times, both eyes appear normal. Could you please let me know if this is a normal developmental occurrence, or if we should bring him in for an evaluation? Thank you for your guidance. Btw baby is 4 months old. Thanks,