Son have intermittent nystagmic jerk since 2 month old. now he is 6 month and it tends to disappear but do it sometimes. ophtalmo say his eyes is ok but cannot tell me what causes that. doctor don't know neither. should he pass mri scan ?

No scan : Understand your concern, but as your 1st doc told you, this can be a normal variant and should resolve over time. Remember the brain is not fully developed at birth and doctors judge milestones such as smiling, reflexes, rolling, etc as signs that the nervous system is developing on schedule. Donne beaucoup d’amour, profiter de fetter etape de developpment. Bonne chance