Purpose: This study analyzed the influence of Interpersonal Communication participants in the promotion of child nutrition in Kilifi County, Kenya.
 Materials and Methods: The study which was guided by the Social Penetration Theory and employed the mixed methods research design. A sample of 10 Health Professionals drawn from Public Healthcare facilities and 247 residents with children aged 5 years and below was drawn from Ganze Constituency in Kilifi County. Data was collected through questionnaires and interviews. Quantitative data was analyzed using descriptive and inferential statistics while thematic analysis was used to analyze qualitative data. Data was presented in tabular form.
 Findings: The study found that multiple sources of child nutrition information existed and influenced the nutrition of a child in different degrees. Such sources included Health Professionals, Family members, Male care givers, opinion leaders and peers. Among these sources Health professionals were identified as the most preferred source of child nutrition information. Additionally, findings indicated that Interpersonal Communication participants largely contributed to the promotion of complementary feeding and an understanding of the effects of malnutrition.
 Implications to Theory, Practice and Policy: This study recommends that mechanisms should be put in place to monitor and evaluate messages emanating from informal sources of child nutrition information in order to negate any false narratives that can counter strides made in the promotion of child nutrition emanating from such sources. This study also recommends that Health Professionals should invest in developing a positive relationship with patients so as to increase the depth and breadth of child nutrition information they can provide.
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