Although spitting up is usually not a serious problem, your healthcare provider should know about it. There are some things that can be done to reduce spitting up. Sometimes other tests might be necessary. Be prepared to report to your health care provider any definite change or decrease in bowel movements or urination, and any signs of discomfort or pain. Spitting up is different from vomiting.
Vomiting usually happens an hour or more after a feeding.
The milk is mixed with digestive juices and has a sour smell. It may be that the baby just took some time to bring up air. It could also be a sign of illness. If the baby seems well and is eating normally, watch him for any other signs of illness. If your baby has a fever, or diarrhea along with vomiting, call your healthcare provider immediately.