It seems baby is having regurgitation ( physiological). Please burp well after every feed and try to position the baby in left or right lateral position after burp with head end slightly elevated in inclined position .This will reduce the vomiting.
Next Steps
Colic drops can be given when the baby is irritable and has inconsolable cry .
Health Tips
Avoid cow or formula mik if in use , and concentrate more on mother's milk .