Slight milk allergy in 11 month old?

[piesoclock]

Could my few days off being a one year old baby have suddenly developed a slight cows milk intolerance?
He has thrown up yogurt the last few times he's had it,and today threw up some cow's milk.
Tge yogurt vom wasn't forceful, more like it just spilled out of him while he was playing after breakfast. The milk vom wasn't much.
He's not done this before with dairy, and he's fine with cheese, although cheesey drool does tend to come out of his mouth. He doesn't throw up other foods. He's breastfed and I eat dairy.
Any idea?