I'd be looking at getting another feed in there somewhere instead of replacing the 9am feed with farex. He is really too young to have milk feeds replaced with solids yet - by all means if you want to start him on solids I'm not going to convince you not to, but nutritionally he is far better off keeping all the milk feeds and then adding extra where you can. When you think about it, most other babies are still waking through the night for a feed and he is going an awfully long time between feeds at night, so it's no wonder he seems extra hungry through the day - at his age he still ideally needs to be having a minimum of 6 milk feeds per day and he is only getting 5.