Vaccinations are an important safeguard for babies on their way to growth, but some babies often have reactions, such as fever or rash, after receiving the leprosy vaccine. In most cases, these adverse reactions are normal, but parents are inevitably still worried. So, how long does it usually take for a fever to get better after a leprosy vaccination? Fever after leprosy vaccination is a normal response of the body’s immune system, a process by which the baby’s body produces antibodies. Because of the leprosy vaccine itself virus, only this virus is harmless. When it enters the baby’s body, it attacks the immune system, forcing it to produce antibodies against the harmful virus. Therefore, after vaccination, the body’s immune system is attacked and temporary discomfort, such as fever, occurs, which are normal. Normally, if a baby has a fever after leprosy vaccination, it usually gets better in about 3 days and the temperature will not be very high. If the baby has a fever below 38.5℃, there are some measures that parents can take to help their babies cool down. For example, you can let your baby drink more water, rest more, and increase or decrease clothing appropriately. Because babies’ ability to regulate their own body temperature is still relatively poor, parents can implement physical cooling for their babies, such as wiping their bodies with warm water. Although bathing can also have a cooling effect, it is best not to bathe the baby immediately after vaccination. Therefore, bathing is not recommended to help cool down the baby’s temperature. When the baby has a persistent fever and the temperature is above 38.5°C, parents need to take the baby to the hospital in time and ask the doctor to find out the cause of the fever so as not to delay the condition. There are pros and cons to everything, and the benefits of vaccination outweigh the disadvantages. Parents should never deny the usefulness of vaccines just because individual babies with specific body types have problems after vaccination. If not vaccinated, they may face more and more serious conditions, even leading to death or disability. Therefore, it is also important for parents to have the right attitude and concept about whether to vaccinate or not.