Hi my 9 month old started suddenly projectile vomiting today like something out of an exorcist movie. It has only happened once then later today when we gave him some rice snacks and pedialyte. He finally had a poopy diaper. It smelt like dead fish. The order was very strong like nothing I ve ever experienced. It was also very stringy and mucousy which I know comes a long with a virus. He has not had any fever. He was treated for an ear infection this past week due to teething. He finished his last dose of omnicef today. I originally thought the vomiting was maybe a reaction to his antibiotic... Is this a stomach virus?