It is absolutely normal for a baby to wake through the night, actually it is quite unusual for baby to sleep through. i know it seems like 'all' baby's do sleep through the night but reality says something different. it sounds like you are doing a great job listening to your baby's cues and following his needs. i know it can be disappointing when you think that they are doing something that is getting you more sleep and then change but that is the life of a baby by following his cues you are helping build a happy, emotionally strong boy. well done. remember they are little for such a short time and soon enough they will be in their own bed listening to their ipod reading mad magazines (my 11 year old!
hugs beckles