Susan by 16 weeks greys are usually fully weaned,some do take slightly longer but in general they will be refusing hand-feeds & eating adequately on their own.It sounds to me as if he is telling you he has had enough.I would drop the first feed you give him & just offer a warm feed before bed,a little warm oatmeal or some baby food,dont be too concerned if he only has a small amount or refuses.As long as he is eating through out the day then there;s nothing to worry about.The little baby squeaks are perfectly normal.Keep an eye on the calcium perch,he may not be ingesting too much,the best way to ensure he gets his calcium is in his food..African greys are prone to calcuim deficiencies so be sure to offer foods which are rich in calcium,bok choy,spinach,broccoli,turnip greens,mustard greens...