it could very well be gas due to the cereal you are putting in his formula. lo's that age have an immature digestive system and can't necessarily digest the cereal as an older baby could. not to mention, it isn't recommended to do this (many people had told me i should to) as it can be a hazard for choking. how many times did he wake before you started the cereal in his bottles? i would definately feed every three hrs as opposed to every two hrs. what does your daily routine look like? i think if u got him on a regular 3 hr routine it would help a lot. it is definately normal for babies that age to wake up once to a few times a night for a feeding. btw - at around three months he will be going through a growth spurt and will need all the extra formula calories he can get!!! maybe look up routines, or EASY in the bw book (i am assuming it is the new one?).