Background: In child health care immunization is a common task for the child health nurse. Often children are unprepared, afraid and preoccupied with pain in the vaccination situation. Most children experience the presence of the parents as important during the procedure. Parents who prepare their child reduce the child's stress during the vaccination situation. An interaction occurs between the child health nurse and the child where participation is a prerequisite for the experience to be a positive outcome. Aim: The aim of the study was to describe the child health nurses' experiences of vaccinating children aged 0-6 years.Method: Semi-structured qualitative interviews were performed with twelve child health nurses. Data was analyzed using a content analysis focusing in manifest content. Results: Child health nurses' experiences of vaccinating commuted between the sense of power and confident. The crucial experience was the support and cooperation that the child health nurses experienced with the parents. It emerged a theme: Participation, three main categories: Sense of power, sense of confidence and cooperation with parents and six subcategories: Abuse, powerlessness, experiences, strategies, common goals and approaches and different goals and approaches. Conclusion: The result indicates that the parents have a dominant role in the vaccination situations with the ability to affect the health nurse's experience. Child health nurse, child and parents must cooperate to vaccinations to be carried out and be perceived in a positive way