No more injections please...
Children catch frequent infections like cough, vomitings and loose motions. These are minor illness and can be settled with supportive care. Often an anxious mother requests for injections to get a fast cure, it's a myth. In fact injections are not meant for fast cure, they may be useful during serious infections. 
Learn how to use medicines or ORS. Remember during these illnesses, your child is already in pain, there is no point in adding to his suffering with injections. 
Learn the pattern of disease from your doctor, as disease follows a pattern which seldom can be modified with injections...