Babies should not take a bath until 24 hours after hepatitis B vaccination. After hepatitis B vaccination, the injection port should not touch water on the same day, and the baby should not take a bath within 24 hours, and should avoid scratching and rubbing the needle port to prevent infection manifestations such as redness and swelling of the wound. In addition to not touching water at the injection site after hepatitis B vaccination, it is advisable to have a light diet and avoid spicy and stimulating food. Pay attention to whether the baby has fever, hard nodules and lumps at the injection site, and even allergies such as skin rashes. Hepatitis B vaccine is a common vaccine, but there are many precautions to be taken before and after the injection, which should be kept in mind to prevent accidents. After vaccination, inform your doctor if you feel unwell, and consult a doctor in case of serious adverse reactions without delay.