This study aims to describe the local guidelines for the supplemental feeding of infants of Swedish women’s clinics with maternity wards. Purposeful sampling was used during a four-week data collection time in 2019. Guidelines from 41 of the 43 Swedish women’s clinics with maternity wards were analysed using qualitative and quantitative content analysis. The information provided, and length of the guidelines varied widely in 38 guidelines. Feeding methods were included in 28 guidelines, but 10 provided no information about feeding methods. The most common feeding methods were cup feeding and feeding probes. Suggestions for supplemental feeding included infant formula (32), breast milk (27) and no suggestions (6). The methods to support breastfeeding were skin-to-skin contact (25), breastfeeding freely (22), a caring plan (18), extra supervision (3), optimising the caring environment (2), supplying a breast pump (1) and breastfeeding observation (1). Twenty-two guidelines included information about how long formula should be given and that the feeding should be phased out gradually. We conclude that a national guideline for the supplemental feeding of infants is needed to ensure equal best practice care for infant safety and the support of parents to increase the breastfeeding rate. More national guidelines are needed in general because it is easier to update only one set of guidelines.