Babies should not be vaccinated when they are sick, whether it is a cold or diarrhea, as long as they are not feeling well. The vaccination will not serve the purpose of preventive vaccination because the antigen in the vaccine cannot form antibodies in the body at this time, and the vaccine will have adverse reactions that will aggravate the baby’s original condition and complicate the baby’s original disease. Vaccinations should not be given during the period of taking antibiotics, and children who have taken some drugs during their illness should be vaccinated one week after the antibiotics have stopped being taken, so as to prevent adverse reactions from occurring. Therefore, it is recommended to continue vaccination after a week of recovering from cold and illness, so as to help produce antibodies to play a preventive role.