Often vomiting is diagnosed as flue or a stomach virus. My endo told me that she may be vomiting because she IS deficient........ so treat as such. We triple dose & if that doesn’t stay down INJECT. As mentioned above, better to give too much than too little in this situation. As a new parent it is always scary the first time but once you have injected you will find that it isn’t that hard. It is amazing how quickly your little one bounces back after proper treatment.