Early motherhood is a major health challenge in most developing countries. The aim of this study was to explore Iranian mothers' experiences of the outcomes of early motherhood. This qualitative study was done using the conventional inductive content analysis approach. A purposive sample of 18 Iranian mothers, with the experience of early motherhood, was recruited with maximum variation in terms of their age at their first pregnancy, their children's age, place of residence, and financial status. Data collection was done via in-depth semistructured interviews and continued up to data saturation. The MAXQDA software (v. 10.0) was employed for handling the data. Iranian mothers' experiences of the outcomes of early motherhood came into two main categories that were named "realization of the childhood dream of adulthood" and "heavy burden of adulthood on the small shoulders of childhood," The four subcategories of the first category were the acceleration of intellectual and mental maturation, strengthening of family relationships, developing a strong identity, and closer companionship with the child. The second main category also included four subcategories, namely, experiencing numerous difficulties, threats to mothers' physical and mental health, threats to children's health, and missing opportunities. Early motherhood is not merely a negative experience; rather it is also associated with different positive outcomes. Healthcare providers need to provide high-quality prenatal, perinatal, and postnatal care services to adolescent mothers and use available opportunities to strongly support them and their children.