I mean I guess you could make your own oatmeal and it would be more nutritious than the boxed cereal. Depending on the oats you buy and such.
1/4 cup of ground oats (do NOT use instant or Quick Cook), ground in blender or food processor
3/4 cup - 1 cup water
1. Bring liquid to boil in saucepan. Add the oatmeal powder while stirring constantly.
2. Simmer for 10 minutes, whisking constantly until cooked.
3. Mix in formula or breast milk and fruits if desired and serve warm.