Add oats, water, and milk to a large pot and bring to a boil.
Once boiling, reduce heat and simmer for about 10-15 minutes, stirring occasionally, until cooked and creamy.
Stir in the cinnamon and allow oats to cool. Then, transfer to ice cube trays or baby food containers and store in the freezer for 3-4 weeks.
*Keep in mind, I like to prep a big batch that will last about 2 weeks. If you want to make a smaller batch, simply double the liquid to oat ratio. 3 cups oats to 6 cups liquid, etc. Hope your little one enjoys!!