Background: Indonesia is ranked fifth in the world for the problem of stunting. Stunting in children under the age of five requires special attention, due to its inhibiting effect on children’s physical and mental development. Stunting has been associated with several factors, one of which is non-exclusive breastfeeding. This study aimed to analyse non-exclusive breastfeeding as the risk factor of stunting among Indonesian toddler in coastal area. Methods: This study was an observational analytic study with cross sectional approach, which was carried out for 6 months, from March to September 2022. The sample population was children aged 36-59 months, who lived with their mothers in the coastal areas of Bitung city, north Sulawesi province. Sampling was done by purposive sampling to get 120 samples. Data collection using questionnaires by interview, secondary data in the maternal and child health (MCH) book, and anthropometric measurements using height for age index, for indicated stunting. Results: The results showed the history of exclusive breastfeeding (POR=2.630), energy intake (POR=2.492) and protein intake (POR=1.857) as the risk factors of stunting. It showed that in the group of children who were not exclusively breastfed, have less energy and protein intake, and poor parenting, have a higher risk of stunting compared to children from other groups. Conclusions: Stunting among toddler can be prevent by controlling many factors, such as guarantees that every mother provides exclusive breastfeeding, and maintains adequate energy and protein intake during the growth period, especially in the first 1000 days of a child’s life.