Hi, this happened to Keira when she was little. This is probably more for what is happening to MGardner because her lo is quite young. Anyhow, Keira started projectile vomiting at aroung 2 weeks old. It was really scary, when dh was holding her up on his chest, her vomit flew to the other couch cushion, and it was never a little spit like she sometimes does now, but it was like what an adult would bring up. She had thrush, so we took her off her medicine, which never did work, then her dr said to take away her Vit D drops until she got older. She is still only bf. We then elevated her mattress, always changed her clothes/diaper on a pillow, and kept her upright after she ate for at least 1/2 hr. She aslo played on her boppy lots. All this seemed to help becuase the projectile vomitting stopped and she would spit up maybe once a week. She is now 5 mos old, and spits up a little more, but she is quite active! Hope that helps a little