The Four Growths (四长生) is a principle in Bazi. The branches Yin (寅), Si (巳), Shen (申), and Hai (亥) symbolise the onset of each season, collectively known as the Four Growths. These branches are linked to the Travelling Horse (驿马星), which signifies movement, travel, and change. This principle is vital in Bazi for understanding the beginnings of seasonal energy cycles and their impact on personal growth and transitions.