D.W.
My exclusively breastfed daughter did the same thing with *all* solids till she was 9 months old. She wouldn't take anything and that was ok. I chalked it up to her telling me what she did and didn't need.
Just keep trying at one week intervals and don't stress over it. Solids are just for practice at this point anyway. Breastmilk should continue to be his primary source of nutrition until age 1(or beyond-I never felt comfortable giving my new 1 year olds cow's milk)