Hi, and welcome to the community. Could you post some pics of Barry so we could view them? The best way to post pics, in my view, is to get a photo bucket or tiny pic account. (see websites). You can upload your pics of Barry and then on the third icon above from the right, post your pics here.
It is is entirely possible his feathering could be changing in color. Usually they have what I call a "pre-molt" at about 4-5 months of age. They do lose those white feathers (I call them down feathers), and often times the feathering will be a lighter color, in your case, the blue colored feathers.
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