All you need is brown rice and old fashioned rolled oats (not the quick cooking kind!)
Grind the rice or oatmeal in the blender to make a fine powder. This will take a few minutes depending on how good your blender is. The rice is a little more difficult to get finely ground.
When you are finished, you should have rice powder and oatmeal powder.
This step is not totally necessary, but you can sift the powder to make it even finer. I did this with the rice powder because my blender isn't great and there were still some chunks in it. I found the cereal came out much smoother in the end. But, you could skip this step if you want.
Most recipes I found called for 1/4 cup powder and 1 cup water, but if you double it, you can have lots of extras that can be frozen.
Boil 2 cups water and then add 1/2 cup of the powder. Whisk frequently for 10 minutes. Then, you are done!
You can save the extra powder for later.
When it's done cooking, it should be a fairly smooth cereal. You can add breast milk, formula and/or pureed fruit. If you feel the cereal is still a bit too thick, you could blend it once it's done cooking.
Stick a few servings in the fridge and put the rest in an ice cube tray to freeze. You could freeze the cereal by itself or mix it with a fruit and freeze.
The banana/rice mixture turned out great once thawed. Once your ice cubes of cereal are frozen, pop the cubes in bags. One cube is one ounce.
Watch your baby enjoy!