The goal of this study is to examine the causes of stress in early elementary years and to understand the relationships among the degree of stress in early elementary years, the mother's child-rearing attitude and children's adjustment to school life. To achieve this goal, a survey was completed by 21 teachers and 102 first graders in the elementary school. The survey was designed to measure the stress in early elementary years, mother's manner for child-rearing and children's degree of to school life. The results of this survey indicate as follows: First, there are significant relationships among the Stress, Mother's Child-Rearing Attitude and Children's Adjustment to School Life. A negative correlation between the degree of children's stress and the mother's child-rearing attitude is observed, and also there is a negative correlation between the children's stress and adjustment to school life. Additionally, there is a significant relationship between mother's manner for child-rearing with self-regulating environment and children's adjustment to school life. Second, the degree of stress in early elementary time is a key parameter which explains the adjustment of school life among the first graders. Mother's child-rearing attitude and child’s self-regulating explain how children adjust to school life. Finally, the degree of stress, mother's manner for child-rearing, and the child’s self-regulating altogether explain how children adjust to school life. These results of this research support the idea that reducing the stress in early elementary years and proper attitude of child-rearing significantly help the children to adapt to their first school life.