I wouldn't worry too much, the lower end of the guidelines is 21. What I did is add some "milk" to all sorts of things. I would not offer cows milk itself until close to, if not after 12 months. I offered formula, yogurt and things made of these products. I offered him an oz of formula to his cereal even though I added more water then what an oz would be. I gave my LO cereal 3 times a day at 7 months so that is 3 oz extra right there. Around 8 months, I offered natural, full fat (mine is 6.5%), gelatin free yogurt. About a tablespoon at first and then more. You can mix it with fruit puree, usually a "cube" to sweeten it. I did this and still do for a snack in the am or pm. Around this time, I also started to make "casserols" like mini pastini noodles (smaller then rice), protein and veggies and "white sauce" using formula instead of milk. I even grate cheddar cheese into it. My lo has a milk protein intolerance and it all worked out fine so you should have even more luck. Hope this helps.