The purpose of this study was to investigate the parenting experience of the mothers with the first child younger than 12 months old. The participant of this study was one mother with the first child was younger than 12 months old. The participant observations and interview transcription, researcher s reflective journal and researcher s parenting diary were collected, and the data analysis were composed of the stages of the transcription and confirmation of the contents of participant observations. The findings of this study was as follows. First, ‘the first step with a new life’ was categorized into ‘the wonder given by the child s growth’, ‘the happiness that gives the best thing’ and ‘the treasure that came to our home’. Second, ‘the way to walk together though it is tough’ was categorized into ‘My baby, you are my everything’, ‘Times that are tough sometimes.’, ‘the person with whom I want to walk along together’ and ‘It s time now to tear down a long wall.’ Third, ‘a new step for happiness of all’ was categorized as ‘another start for the future’, ‘the conditions of selecting a job’ and ‘making a firm resolution’.