The baby will usually have redness and swelling at the vaccination site after the vaccination, which usually occurs within 24-48 hours, and can be relieved by applying cold compresses to relieve the local redness and swelling and other discomfort, if the leg is swollen, it is necessary to clarify whether it is due to the vaccination or caused by some other mosquito bites or trauma. If it is indeed related to the vaccination, cold compresses can be applied to relieve the symptoms, if it is not related to the vaccination, consider the local inflammation caused by mosquito bites, it is necessary to carry out some special treatment such as iodophor disinfection, if it is due to trauma, such as the child’s mobility and other special reasons, still need to take the baby to the hospital under the doctor’s detailed examination, to give further treatment.