Limb development is a complex process that occurs during embryonic growth, where the limbs form from specific regions of the embryo. This process begins with the formation of limb buds, which are small protrusions that eventually develop into arms and legs. The growth and differentiation of these buds are influenced by various genes and signaling pathways, including the Sonic Hedgehog and Fibroblast Growth Factor pathways. As the limbs develop, they undergo several stages, including the formation of bones, muscles, and skin. The apical ectodermal ridge plays a crucial role in limb elongation and patterning. By the end of the embryonic period, the basic structure of the limbs is established, setting the stage for further growth and refinement after birth.