Breastfeeding is an important biological process through which infants receive nourishment in the form of breast milk from their mothers. This study examined how well nursing mothers in the Port Harcourt Metropolis of Rivers State understand exclusive breastfeeding. A cross-sectional research design was used. The study targeted 3,414 nursing mothers, from which a sample of 338 was obtained through a multistage sampling technique. Data were gathered using a structured questionnaire that produced a reliability coefficient of 0.87. The responses were analysed using percentages and Chi-square statistics at the 0.05 significance level with the assistance of the Statistical Package for Social Sciences (SPSS Version 27).

The findings showed that 225 respondents, representing 70.3%, demonstrated good knowledge of exclusive breastfeeding. The analysis also revealed that there was no significant association between mothers’ knowledge of exclusive breastfeeding and the support they received from their partners. Based on these findings, the study concluded that nursing mothers in Port Harcourt Metropolis possess adequate knowledge of exclusive breastfeeding, which is essential for its proper practice. It was further recommended that mothers continue to strengthen this knowledge by actively seeking reliable breastfeeding information, including through appropriate social media platforms.