In June 2025, the mental well-being of young people declined compared to three months earlier. Fewer young people felt happy most of the time, while more of them experienced loneliness, stress and suicidal thoughts. In addition, more young people contacted the GP because of suicide-related thoughts and attempts. On the other hand, confidence in the future stabilised, and fewer young people reported having physical symptoms. These findings are from the sixteenth quarterly survey. The results of this study are part of Health Research for COVID-19.