The problem you are facing is probably the most common reason that takes parents to a paediatrician, especially at odd hours in the night. Unfortunately, most of the times, there is no specific reason that could be assigned to this problem,even after a through physical examination. However, as a paediatrician, even if I am not able to point out a cause for such crying after examining the baby, I would be happy because this would mean that the possibility of something really wrong with the baby is rare.
Next Steps
I would advise you to take the baby to your paediatrician and get him examined before embarking on any home remedy.
Health Tips
Try avoid unnecessary medicines. Remember, all of them are medicines even if they are extracts from herbs!