The emergence of process writing and the advent of whole language during the 1980's challenged the 50 year practice of focusing on reading before teaching writing to young children. Today, writing as well as reading is clearly of great interest from the earliest stages of literacy development.
Hertz, M., & Heydenberk, W. (1997). A Kindergarten Writing Workshop: How Kindergarten Students Grow as Writers. Reading Horizons, 37 (3). Retrieved from http://scholarworks.wmich.edu/reading_horizons/vol37/iss3/3