My son has swcah and when he was young he did that very same thing. He would vomit just to vomit. They put him on all kinds of meds for gastric reflex. We even had upper and lower edoscopy done as well and they all came back ok. He was and has been on florinef and cortef since birth and same amount. I think that it is sometimes a sensory issue with them but my son did grow out of it I guess you could call it that. I know that it is hard though to watch her baby go through something like that but it will get better. I will keep you in my prayers!!