A qualitative research with multiple methods, which investigates the phenomena of language shift and sustainment it of one Diné family. A Diné father was interviewed. The mother tongue should still be use at home however, the Navajo language is taught at school. I spent eighty plus hours interviewing the Diné father. I spent countless hours of observing Shizhe’é and the interview was all done in Diné Bizaad. Shizhe’é explained the challenges and obstacles of maintaining the mother tongue.

Early childhood is a special and amazing period in a child's development. It is a period during which all facets of a human being-cognitive, linguistic, physical, emotional, social, and spiritual--are rapidly developing and influenced by a child's interactions with her socializers and environment. Fundamentally, what happens during this critical period will influence and impact a child's future learning. Much of what is known about children's development comes from research focusing primarily on mainstream English speaking children. However, not much that is known about Indigenous children and their early period of child development. Therefore, this thesis research focused on Diné children and their early childhood experiences that occur during the fundamental time period before Diné children enter preschool. It also examines the contemporary challenges that Diné parents and other cultural caretakers face in ensuring that Diné infants and young children are taught those important core elements that make them uniquely Diné. The research questions that guide this thesis are: 1.What do Diné people believe about children and their abilities? 2.What do Diné children need to learn in order to become Diné? 3. What are the Diné childhood rearing beliefs and practices? 4. Why aren't Diné parents and grandparents teaching their children how to be Diné? Findings reveal an early childhood experience in which children are viewed as true explorers and highly intelligent, inquisitive learners and included as integral participants and contributors to the family and community. This thesis concludes with a discussion of the multidimensional transitions, such as the shift from the Diné language to English in Diné homes and communities that have occurred in the Diné way of life and how they have impacted how Diné children are socialized. Creative alternatives for increasing Diné childhood speakers on and off the Navajo reservation are also considered.