Babies who love to sleep after vaccination may be prompting parents that it is a bad performance, parents need to pay attention to: 1. sometimes it is a normal performance, when the baby is vaccinated there will certainly be crying, struggling and other performance, after vaccination strength is basically exhausted, will be tired to just fall asleep. 2. inflammatory reaction may occur, each baby vaccine reaction is individual differences, the vaccine is the viral component of fire extinguishing, if The baby has wind chill, fever, skin disease, malnutrition, diarrhea and other diseases just in time for vaccination, instead, because of low immunity is easy to be infected, thus appearing love sleep, poor mental response and other clinical symptoms. 3, some babies may have allergic reactions after vaccination, there will also be love sleep symptoms, while there may be breathing, heart rate changes, after the vaccination parents do not immediately take the child Parents should not take the child home immediately after vaccination, but observe the child for half an hour at the hospital where the vaccination was given, and leave the hospital where the vaccination was given only if the child does not have any abnormal and unusual conditions.