The entorhinal cortex is a crucial hub for the coding of animals’ experiences in space. Grid cells, key components of this network, exhibit multiple firing fields that tessellate the environment as a function of the animals’ location. At the population level, the dynamics of the grid cell network reside on a toroidal manifold, irrespective of the sensory inputs or behavioral state, in agreement with continuous attractor networks (CAN) theories.However, the developmental origin of toroidal topology remains to be determined. Using Neuropixels 2.0 we obtained high-density population recordings in the entorhinal cortex of developing rat pups. We uncovered, and quantified, the presence of toroidal manifolds as early as postnatal day 10 and 11 (P10-11), before eye and ear-canal opening and before active exploration outside the nest. Toroidal manifolds abruptly emerged between P10 and P11, rapidly exhibiting adult-like characteristics. Distinct toroidal manifold can be simultaneously recorded along the dorso-ventral axis as early as P12, suggesting that modularity is an inherent property of the grid system. From P16 onward, we observed the gradual emergence of individual grid cells in the same cell population from which the toroidal manifold was initially detected. Similarly, we consistently detected ring attractors in pre- and para-subiculum as early as P10 before head-direction cells display their characteristic tuning.Our results demonstrate that the organization of neural networks for the coding of space has strong experience-independent components, rooted in the early postnatal organization of medial entorhinal cortex circuitry.