During early childhood which factor is most important in stimulating growth at the epiphyseal plate?

During early childhood, growth hormone is the most important factor stimulating growth at the epiphyseal plate. This hormone, produced by the pituitary gland, promotes the proliferation of chondrocytes in the growth plate, leading to increased bone length. Additionally, factors such as nutrition and physical activity can support the effects of growth hormone by ensuring that the body has the necessary resources for optimal growth.