If he calms down n sleeps after taking feed, then it indicates he was hungry. At this age they have a small stomach. So he needs milk every 2 hours. By crying he is making you aware of his needs. Don't worry. It's normal.
If child is growing well, (putting on weight) passing Clear watery urine six seven times a day and is active, playful, then there is no need to worry and do anything more. Continue exclusive breastfeeding for six months.
some babies will develope evening colic pain at the same time every day. if your baby cries every day on the same time you can give daily half and hour priornto the cry. otherwise no need to give it regularly.