I'm not an expert, but keep in mind that he is getting liquids from the friuts and veggies that he eating. Also Candy has an awsome website with a spreadsheet on it to help calculate to ca:ph ratios for the different diets out there. He site is:
go to the diet calculator and put in what you're feeding your baby, and the spreadsheet will tell you the ratios. It's made things so much easier, cause like you, I couldn't for the life off me figure out the math for the ratios. Where are you located and where are you willing to travel for a freind for your little guy?