Starting oatmeal

At night, Scarlett loves to cluster feed, but I find myself struggling with milk supply after she eats from both sides. She gets very frustrated and whiney until she falls asleep. She loves food, loves watching us eat, so I’m tempted to start her on a small amount of oatmeal before bed. I would do homemade vs store bought. I had plans on waiting till 6 months to do BLW, but she just likes to eat so much. Has anyone started cereal or food yet?