Baby intelligence tests should be done by professionals at the appropriate professional institutions and are generally more accurate. However, when a baby is tested, it can vary according to his mental state, hunger level, and tolerance level. If the child is not in a good mental state, this can cause differences in the IQ test results. It is best to test the child’s intelligence in a quiet and stable environment without hunger or abnormal crying, as this is relatively accurate. If the child is found to be mentally retarded during the test, it is recommended that the child be retested once in 1-2 months to further determine his condition, which is relatively accurate.