When you say he's been feeding himself since 5 months? you mean finger foods? as Bethanie has been doing that from about 5-6 months also.
Im in a rush a lot of the time and admittedly, just feed her main meals myself.. it's only the past month or so that i've tried to encourage her more with her own fork and can see a big improvement. Im glad to hear that Rhys is similar with his eating though.

ty