Self feeding

When I told E's doctor at her 6 month appointment that we were going to encourage self-feeding he sort of chuckled and said, "um no, she won't be able to do it". Well here Mr. Doc, here is a picture of my 6 month old feeding herself:

I do feed E most of the time, but encourage her to feed herself when she is interested.

She also drinks from a glass (with me holding it). I imagine this is not too impressive and actually quite common for breast fed babies. E won't touch a bottle, sippy, or anything resembling anything other than a cup. She will close her lips tight and turn away. She will however drink from anything I drink from which actually has me wondering if I should start drinking from a sippy...