Hello and welcome to e health forum.
Gastric reflux has nothing to do with Squint or Strabismus or Pseudostrabismus(the eye condition, your kid might have).
Strabismus can be either a disorder of the brain in coordinating the eyes, or of one or more of the relevant muscles' power or direction of motion.
Pseudostrabismus is the false appearance of strabismus. It generally occurs in infants and toddlers whose bridge of the nose is wide and flat, causing the appearance of strabismus. With age, the bridge of the child's nose narrows and the folds in the corner of the eyes go away.
You might consult your doctor and a opthalmologist for proper advice on further management.