Simply add rice or oatmeal into your grinder, and pulverize until it is a powder. This takes about 10-20 seconds.
Once you've ground your oats into oat powder, you're ready to make baby oatmeal.
Bring 1/2 cup of water to a boil, then add in 2tbsp of oat powder, and whisk continuously for 30 seconds. Turn the heat down to medium low, and continue to cook for another 3-5 minutes, stirring occaisionally.
To thin, use breastmilk or formula. For older babies, add fruit or vegetable puree, and experiment with spices such a ginger (great for digestion!), nutmeg and cinnamon!
The type of oats that you choose doesn't really matter. We had large flake oats in the house at the time, so that's what I used. For added nutrients, use steel cut! In a pinch? Minute oats are just fine!
The recipe above provides one serving of baby oatmeal. You can make a larger batch and store in a sealed container in the fridge for up to 72 hours.