Thank you for your query.
Weak eyesight is usually associated with squint
and once the proper lenses are prescribed and used, squinting reduces. The child has to be followed up for it.
If the child has started going to school very recently then some children do present with regression in behaviour which can explain the stuttering
. It shall be better to discuss the issue with the teacher and observe the child. In case there is deterioration then an examination by a doctor is warranted to rule out any neurlogical reasons.
I hope I have answered your query to your satisfaction.