You don’t need to go canceling your child’s vaccination appointment if he has the sniffles, cough, upset stomach, sore throat, ear infection, mild diarrhea, low-grade fever (less than 101*F), among whatever other mild symptoms may arise. He is still able to get his vaccinations, and here’s why:
Vaccines don’t make mild illnesses worse. In fact, your kiddo’s immune system battles millions of microbes and foreign antigens every day and vaccines offer only a teeny tiny fraction of those antigens for the immune system to process. For otherwise healthy children and babies, vaccines can not overload the immune system; in fact, that would be really hard to do. (For more about not being able to overload the immune system: HERE)
Vaccine also don’t make symptoms of mild illness worse. However, vaccines can SOMETIMES cause soreness and swelling at the injection site or mild fever.