I had to get in on this topic.  This is not research based but my own
experience. My son had crossed eyes and began treatment at 4 months of
age.  His doctor, at that time, told me his chances of seeing
binocluar were slim but he was glad I was breastfeeding because he
would use each eye equally due to the positioning and feeding from
both sides with the "top" eye being used on each side.  He did have
patches alternating eyes and did have surgery for part of his problem
at 19 months.  He weaned about 2-3 months later.  He wore glasses
after that surgery which we were prepared to be a lifelong thing.  His
eyes only improved and has not worn glasses for the last 6 years.  He
is 14 now.  I think being breastfed made this outcome with all the
biospecific properties to develop his eyes from the very beginning, to
positioning, to healing after surgery, to being content with wearing
patches and glasses, to the self confidence from any teasing he got
about his glasses to his seeing binocularly at his point which wasn't
supposed to happen.  I share his story in my classes, not only with BF
moms but also giving a bottle and how positioning is so important with
them also.  Thanks for letting me share this.  Tyler and I are very
close because of breastfeeding and having to go thru his early years
of eye "problems"