The following reasons are common for drowsiness after the rash of early childhood acute rash: 1. It is a normal performance of the recovery period of the disease. Because the fever will subside after the rash emerges, the baby’s continuous high fever course of 3-4 days leads to poor mental state, and after the fever subsides and the rash emerges, the body is tired and the phenomenon of rest occurs, without special treatment. 2. Combined viral encephalitis. In addition to lethargy, the baby has extremely poor mental state, depression, poor appetite, and cannot be easily woken up, so go to the hospital promptly and have a lumbar puncture examination if necessary.