Babies cry after vaccination mainly due to the following reasons: 1, the baby contacted strangers during vaccination, while the vaccine this behavior causes the child to have a sense of pain, the child may be frightened, so there will still be crying behavior after vaccination, especially in the sleep will wake up. 2, because the local formation of redness, swelling, hard knots and so on after vaccination, which is a normal side effect. This is a normal side effect and usually does not require special treatment. If the child cries more obvious, can give local cold compresses, ice compresses to relieve the pain, the child crying can be relieved. 3, due to the vaccination after the child may be accompanied by the phenomenon of fever, the temperature rises when the child will show uncomfortable, but also will show the phenomenon of crying. You can give the baby to drink more water, at the same time with warm water to wipe, do not wipe to the site of the vaccination, to avoid infection, so as to play the role of cooling, so that the child may not cry again.