In the wild they would molt about twice a year, a major and minor molt. Because we keep them inside their biological clock gets a bit off kilter. It's hard to predict exactly when our pets will molt.Things like diet, length of day, humidity, etc. will have some effect on molting. I'd expect a minor molt at about 8 months and another at maybe 14 months. Of course plucked feathers (missing feathers) could be replace at any time.(more so with flight feathers than contour feathers)