Hi Krupali
It‘s possible that your baby may have developed some colic or reflux. For the colic you are already on colicaid drops. I also suggest you to take a break in between the feed and burp your baby then continue feeding. You are already using propped up position for the reflux. Inspite of all these measures if symptoms continue and your baby isn’t gaining weight appropriately then your baby requires to be examined by a pediatrician.