Slight nasal congestion can not be vaccinated, if the baby has a slight nasal congestion, the main consideration is that it is a symptom before the cold. Generally speaking, you can’t get a vaccination when your baby has a cold, because vaccination is a foreign antigen, and if you get a vaccination when your baby has a cold, it will cause an antigen-antibody reaction, which will make your baby susceptible to fever and lead to other illnesses. The injection during a cold will also cause the symptoms of the cold to worsen, so you can wait until your baby has completely recovered from the cold before injecting the vaccine. If you have already given your baby the injection, you should give your baby plenty of water to promote the elimination of toxins from the body, and avoid taking your baby to densely populated or unventilated places to play. Once you find that your baby is not feeling well or has a high fever and other symptoms, you should take your baby to the hospital for a checkup.