Whether a baby can be vaccinated when he or she has a cough depends mainly on what the cause of the child’s cough is. If the baby’s cough is mild and is only caused by cold air irritation or dry air, etc., he or she can be vaccinated; if the cough is frequent and there are respiratory infections such as nasal congestion and fever, the vaccination is not allowed. As the baby’s respiratory system is not well developed, it is easy to have a mild cough when encountering cold air stimulation or dry air. If the child has a normal temperature, no other discomfort, eats milk normally and is in good spirits, it is considered to be a normal situation and there is generally no need to worry too much and the vaccine can be administered. If your baby has frequent coughs, nasal congestion, fever, etc., there may be a possibility of respiratory tract infection. In this case, vaccination is not allowed, and vaccination may aggravate the occurrence of adverse reactions such as the child’s cough, and secondly, it may lead to a significant reduction in the effectiveness of vaccination. Therefore, when a baby has a cough, if the cough is only occasional and there is no other discomfort, the vaccine can be administered; if the child has a frequent cough, is in poor spirits and has fever and other discomfort, he or she needs to go to the pediatric clinic of the hospital in time to clarify the cause of the cough, get further treatment and wait for recovery before vaccination.