You should not have your child or children younger than six months of age get the shot as they are too young. Those with severe, life-threatening allergies to flu vaccines or any ingredient in the vaccine should also not get the shot, and this might include antibiotics, gelatin, and other ingredients. Knowing when to get the flu shot is a discussion you need to have with your doctor or a healthcare provider. Your doctor or healthcare provider may help decide if the vaccination is right for you and they may suggest a vaccine for your situation. People who go to get their flu shot are also required to fill out a questionnaire, which is important for everyone’s overall health.