Leafs were red when they first came out and gradually turned green

Quick answer：

This describes the color change of leaves over time. In many plants, particularly deciduous trees, leaves start off red due to pigments such as anthocyanins, which can be a response to cold weather or stress. As the seasons change, these pigments break down, and chlorophyll, which is green, becomes more prominent. This is a natural process that helps plants prepare for different seasons or conditions.