Projectile vomiting question

Mackenzie

My 2 month old got her first round of vaccines yesterday. She cried like most children do and then projectile vomited. I figured it was just because she cried so hard. But yesterday throughout the day she was projectile vomiting. She only kept down 4oz during the day. And today she is still vomiting. Is this a reaction? Is it GERD or acid reflux? Just really worried.