If a child does not feel unwell after vaccination, he/she can usually take a bath after 3 days. If your child develops localized redness and swelling at the vaccination site, or fever or malaise after vaccination, you need to delay bathing appropriately to avoid aggravating the existing discomfort. If there is no discomfort after immunization, the child can take a bath 3 days later. If you bathe your child too early, it may cause localized infection at the vaccination site, which may lead to local inflammatory reactions, such as redness, swelling, pain, and fever. If your toddler has redness, swelling, pain and other uncomfortable reactions at the vaccination site after vaccination, you need to delay your toddler’s bathing time, and you need to wait for the inflammation at the vaccination site to subside before bathing, and if the local redness and swelling are serious, it is recommended that you go to the hospital in time to be dealt with by the doctor. If fever, fatigue and other discomforts occur after vaccination, you need to wait until the symptoms are relieved before taking a bath, to avoid aggravating the discomfort due to bathing in the cold, and if the discomfort persists, you need to go to the hospital in a timely manner. Most children can take a bath after 3 days of vaccination, but the specific time for children to take a bath needs to be judged according to the recovery of the vaccination site. It is recommended to keep the vaccination site clean and dry and avoid touching water. In addition, children should stay at the vaccination site for half an hour before leaving to see if they have any adverse reactions.