If your baby is sleeping after vaccination, you should pay attention to taking the temperature of your child to determine if there is a fever. Because some babies may have fever after vaccination, as most vaccines are biochemical agents, fever may appear after vaccination. Early detection and early treatment can be done by physical cooling, or if the temperature is above 38.5 degrees, antipyretic drugs can be used to relieve the fever, such as ibuprofen granules. Body temperature can be measured three times a day to observe the change of body temperature. Also pay attention to observe whether there is redness, swelling and pain at the injection site, and to avoid infection of the wound. Some babies simply show the thought of sleeping after vaccination, if they wake up in good spirits and have good eating condition, it does not matter. In addition, the child may also be caused by fright. Pay attention to let the baby rest more, and the sleepiness will be relieved after a while.