Generally, baby burps about 10 times per feeding.
To know whether your baby is finished with his meal, always remember to monitor his weight gain. A goal for your tiny baby would be to take 3% of body weight after every feeding. If you are breastfeeding, keep track of how often they nurse and at what time intervals during the day. Remember this also depends on how long the feedings takes so it's probably not an exact science but it will begin to become more familiar as you continue nursing or bottle-feeding.