It seems from the history that your 6 months old baby is having squint
and as you have told less fixation on the right.
The common type of squint in children is accommodative squint. The treatment of the condition is by refraction
and correction of the refractive error
and patching the abnormal eye to straighten the squinting eye.
Many cases do improve with the above mentioned treatment on which your baby is on as of now.
However few cases may require surgery to straighten the eyes if the above method fails to treat the condition.