i don't know how old is your bb. Mine is also like this until 12 month. I am so frighten when i feed her every time because whenever she vomit, i am so busy...comfort her, change her cloth, change my cloth, clean the floor, the chair,etc. But she stopped vomit after 12 month old, maybe the valve between the esophagus and the stomach is fully mature and close properly by that time.
So,now you may try to feed your bb bits by bits and let bb "ur" air more frequently.
Don't feel sad, always think that things will be better later.