Not every change in behaviour means a crisis. But if a child remains withdrawn for a long time, loses interest in usual activities or constantly complains of fatigue, it is worth paying attention.
What to notice
What matters is not a single sign, but its duration and impact on sleep, learning, communication, appetite and contact with close people.
How to start talking
Start not with interrogation, but with presence: “I see this is hard for you. I am here and ready to listen”.