A scattering medium scrambles the incoming wavefront and creates a speckle pattern. In this project, we studied photon transport in scattering media composed of nonlinear scatterers, specifically second-order nonlinearity. This type of medium generates speckle patterns of both the harmonics. We explored the spatial and temporal diffusion in finite-sized nonlinear disordered media. Subsequently, we explored speckle correlation for both the harmonics.