same as my bb... he used to 嘔 so much!!! made me really scared everytime i feed him... now thinking back, maybe he's really full/diddn't want to eat, & i was forcing him to drink, therefore he cried a lot during each feed & used to 嘔 a lot...
but if your bb 嘔 after every meal, & if he looks tired/dull, then it's better to take him to the doc for a check up... if he just 嘔 occassionally, then it's ok... my bb sometimes used to drink not more than 15oz a day when he's 2-5mths...