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.
After giving colicaid if she still cries alot then you have to look for other reasons like insect bite, running nose, hunger cry etc. Then we can decide to give ibugesic or not. Thank you.