Background: The breastfeeding statistics are high in Sweden but there has been a decrease during the past decades. It is the Child Health Nurses (CHN) duty to promote, support and maintain breastfeeding. The CHN is a very important person for the child and the new family constellation because she possesses expertise and skill and reaches 99% of all newborns and their families during the first year of life. Aim: The aim was to investigate the CHN experiences of giving breastfeeding support. Method: The study had a qualitative design and was conducted through individual interviews. Nine CHN in two different regions in Sweden was interviewed. The material was analyzed with a qualitative content analysis. Results: Three categories emerged in the result: promoting factors for giving breastfeeding support, impeding factors for giving breastfeeding support and to be adaptable for the unique mother. Giving breastfeeding support was related to many factors surrounding the nurse and the woman. The partners involvement in feeding caused a dilemma for the CHN because the involvement endangered the exclusive breastfeeding but at the same time the partners interest is important for the mothers wellbeing. Conclusion: Breastfeeding support is complex and influenced by many different factors. The core of successful breastfeeding support is to have a person centered approach and to increase the mothers self-efficacy.