Place the banana, coconut milk, cereal and cinnamon into a blender or food processor. Puree for 30-60 seconds or until completely smooth. If breakfast cereal is too thick, add in more coconut milk 1 tablespoon at a time until you reach your desired consistency. If baby prefers their cereal warm, add cereal to a small saucepan and gently warm or add the cereal to a microwave saft bowl and microwave in 20 second increments until warm.