I gave my 2 yr old beans this afternoon he vomit them later at night just once he's fine no fever he's eating normal , what caused him to vomit ?

Bad beans?: I'm glad he's doing well after vomiting. He may have had a bad batch of beans, and his body decided to get rid of it fast. As long as he is eating and drinking normally, and he is acting himself, there should be nothing more to worry about. Sometimes stress and changes can cause kids to vomit, but it doesn't seem to be the case. If he continues and/or starts to feel sick, go see his pediatrician!