introduced barley cereal and baby threw up?

[M F]

He had no problems with rice cereal other than he doesn't like it.Tried many many times. He has had most of the stage one jarred food (no meats) with no problem. Doesn't like anything orange as of yet(had a cousin who was the same way). I introduced barley cereal today and he threw up after 3 spoonfuls. He hasn't done this with any other food.

He is solely breastfed aside from introducing solids. He was spitting up quite a bit yesterday and he didn't have any solids. I drank milk yesterday and the day before which is out of the ordinary for me. I do eat other dairy foods though.

I am making a list of everything for the appointment in 2 weeks but until something major happens I want to refrain from his doctor. His doctor never calls back and I am in the process of finding a new doctor for that reason.


He is not sick in any other way aside from the fact he is starting to teeth I think. Could it be food sensitivities? Or any other options... I am a new mom...
I will try barley again in a few days I guess.

What about the milk thing? just a coincidence or does it signify something? I rarely drink milk aside from maybe 1/2 cup with cereal but only about half of that is really ingested and the past two days I have had cups of milk to drink and he is spitting up which he never does.