I wouldn't do the cereal thing unless Dr recommended. Babies wake up a lot. I used white noise with my girl and that helped her sleep. Until her four month sleep regression.

Here’s a good read

My daughter gets up every four hours your child is normal

He is too young for cereal. Babies can choke on it so you should never put it in a bottle. He is also far too young to start any solids yet, it can actually do a lot of damage to their stomach. It’s totally normal for him to be waking up every couple hours to eat. Their stomachs can only hold so much formula/ milk at a time. It’s your choice but as a veteran mom I wouldn’t recommend it. You will do more harm than good.

He's too young for that and it's not guaranteed to make him sleep. He's still used to being inside you and needing comfort. Seems weird but sleep is something they need to learn and my son still wakes.