My little white chicken, Fifi, is about 5 years old, and constantly gets vent prolapses. Yesterday was her fourth vent prolapse, although it was quite small and only last 1 hour, I'm still worried for her. Her third time was the worst. I literally thought she was going to die. I don't know what is causing this and how to stop it, she lays eggs rarely. She gets them about 1 month apart from each other. Please help. Should I feed her something different? Medication? Cream?