Also what did you mean by his day time routine unsettling his night?
If he is getting too much or too little sleep in the day then it can have an impact on the night. Being over tired or under tired means they don't sleep so well. If he is napping well during the day then it probably won't be that. At this age on a 4 hour EASY he should be having 2 naps of 1.5-2 hours and a cat nap.
Are you giving the infacol with every feed? If not try that as it has a cumulative effect and needs to be given at every feed for a good few days before it makes much difference.
The night bottom burps could just be developmental as his digestive system is growing. My two were both awful during the early hours, DS used to fuss/fidget for a while, then pass wind, be quiet for a little while and then start all over again. DD was the same but she used to slam her legs down on the matteress... that was fun

. They both did grow out of it around the 4 months mark though, so hopefully it will pass. My two are both refluxers though so I don't know if it was connected to that - any signs of reflux with your LO?
Laura