hii my baby is 2 month 10 days year old .. after breastfeed he was not burping so I had make the straight position and wait for 35 mins and after that I put him down. after some time he is act like he will vommitt but it doesn't come out side... again after 1 hour he is asking for breast feeding. he burp and again some time he actually like vommitting .. can u please tell me what exactly I need to do