Can you tell if you’re going to have a small growth spurt or a big growth spurt? I’ve had friends who have come back from the summer and had gotten 6-7 inches taller. Is my growth spurt going to happen in the summer?
Growth is controlled by your genetics, so I can’t predict the amount you will grow during a growth spurt.
You notice your friend’s growth because you had not seen them in several months. Thus, the change seems more dramatic than if you saw them every day. When you will have a growth spurt is only predictable in a broad area of time (within a year).