Linnea Ehri conceptualizes word reading development into four phases: pre-alphabetic, early alphabetic, later alphabetic, and consolidated alphabetic.  Each stage illustrates how word-reading develops for typical children between the ages of four and six.  The model also demonstrates how phonemic awareness skills and orthographic mapping are crucial foundational skills for children to develop automatic sight word recognition. 

Anna Geiger, also known as The Measured Mom, compiled this index of podcasts that have to do with all things Science of Reading.  You can contact her and find her resource on her website:  https://www.themeasuredmom.com/