This study evaluated the effect of father's feeding practices on biochemical and haematological parameters in children under five in Birnin Kebbi, Nigeria. A cross-sectional study design was used and a structured questionnaire was administered to a sample of 150 fathers. Haematological and biochemical parameters of the children were also determined. Descriptive and inferential statistics were used to analyze the data obtained. Data of biochemical and haematological parameters were subjected to one way analysis of variance and significant difference was established at P˂ 0.05. The results revealed a significant association between father's feeding practices and biochemical and haematological parameters in children under five in Birnin Kebbi. The study concluded that there is a need for health education programs to be designed to improve the feeding practices of fathers in order to improve the biochemical and haematological parameters of the children. This study contributes to the literature on the importance of fathers’ feeding practices in the health and wellbeing of children, particularly in developing countries.