I need help with my 9 month old's sleep issues?

Your baby DOES NOT have any sleep issues! he is just 9 months old! yeah you were lucky the 1st time around but the reality is, most babies are this way. You have very high expectations of him. Finally, you say you are mixing cereal with his night bottle, this won't make a bit of a difference in his sleep, plus you are making your son face every night a choking episode. Just google it, is not that hard, bottles and cereal are not supposed to be together! If your Pedi suggested this, then you need to change to an actual good doctor.