The study focuses on the causal relationship between mycotoxin exposure (particularly aflatoxin B1), birth outcomes, and height for age among young children in Nepal. Previous studies have shown a strong association of stunting with mycotoxin exposure yet causality has not been proven. Thus, this study will provide a better understanding of the association between maternal and/or early life mycotoxin exposure (rates in the blood and breast milk) and infant and young child growth. This information is essential if we are to more fully understand and effectively address the high rates of stunting in Asia.