My 11 yr old daughter was recently tested for PCOS, per my request. She's had rapid weight gain since the age of 3. At best, I've been able to stablize her weight through diet and exercise, but only for a period of time. If she faulters, even slightly from healthy eating, she instantly gains weight. PCOS does run in my family - one sister was diagnosed in her early twenties, the other sister has all of the symptoms.