Babies sometimes have paroxysmal crying after BCG vaccination. If there are no obvious discomfort symptoms after vaccination, babies only cry in paroxysms for a short period of time. If there is redness, swelling, heat, pain, or fever, nausea, vomiting and other discomforts locally after vaccination, the baby may cry for a longer period of time, usually about 2-3 days. After vaccination, pay attention to the following: 1, if the baby continues to cry for a long time, it is recommended that the baby must be taken to the hospital neonatology department for follow-up, to make clear whether there is a BCG vaccination serious adverse reactions or disease infection, and then actively give appropriate treatment; wait until the condition stabilized, the baby’s crying phenomenon will also be relieved; 2, the baby after BCG vaccination parents should do a good job in the baby’s care, within 72 hours of the inoculation Avoid the inoculation site contaminated with water, so as not to cause local infection; you can feed the baby some water to promote metabolism, closely observe the baby’s body temperature changes, keep the baby warm moderately, avoid overheating or overcooling, to avoid the baby catching a cold.