A few hairs growing on the place where the baby has been vaccinated usually have no effect. This situation usually has nothing to do with the vaccination, mainly because of genetic factors and their own endocrine hormones, it just happens that these hairs grow in the place where the vaccine has been administered, which is a normal physiological phenomenon that will not affect the health of the body, and does not require any special treatment. However, because babies are relatively weak, they need to stay in the hospital for a period of time after vaccination to make sure everything is normal before leaving the hospital to avoid accidents. Do not bathe the baby on the day of vaccination, keep the skin of the injection site clean and dry, do not eat allergic foods, and keep an eye on the baby’s temperature. If any discomfort occurs, consult the doctor in time and take active treatment, so as to avoid delaying the condition.