Putting cereal in the bottle.. pros n cons?

It's okay to add a little more cereal, it won't hurt the baby. The guidelines are just that - advice, not rules. The baby won't adjust right away, you just have to keep offering it on a spoon and eventually the baby will come to realize it's food. It's going to take time, and you just have to be patient, which I know isn't easy when they only sleep 2 hours at a time. I went through the same thing.