Baby vomiting after eating

Lindsey
Does anyone else's baby vomit after eating? It's literally only once a day and I know its not spit up because he heaves when he does it and its alot. 😞 He has an appointment tomorrow with the doc so I'll talk to him about it then but I was wondering if anyone else's baby is doing this. I feel so bad because he looks so uncomfortable when he's vomiting. He also hasn't gotten back up to his birth weight yet I'm not sure what to do.