Knowing the properties and behavior of powders and granular media is essential for many industrial applications. Powder behavior is not only critical for the manufacturing process and transportation, but it also influences the product’s final use. Thus, properties influencing the solubility of infant and toddler formula are important parameters to be investigated. This application report presents multiple characterization methods such as specific surface area, particle size, and permeability, to define the nature of infant/toddler milk powder with respect to formulation. Furthermore, the particle size and rheological behavior of the final dissolved milk powder, prepared based on the manufacturers’ instructions, were investigated. Those results provide important information about the milk flow out of the baby bottle during consumption as well as the texture of the fluid.