This document discusses the concept of garbha-poshan, or fetal nourishment. It describes the two main stages of fetal nourishment: 1) In the first stage, the fetus receives nourishment through the mother's upsweeda and upsweda, which provide dense nutritious material and less heavy material like vitamins and gases. This occurs through processes like diffusion, active transport, and osmosis. 2) In the second stage, the placenta plays the primary role in selective permeability and transfer of particulate matter and macromolecules to the fetus. Ancient Indian texts described this mechanism as occurring through the kedarikulya nyaya, where microvascular channels carry nourishment