To diagnose whether a newborn is suffering from sericea, we need to analyze the clinical symptoms and test the G6PD enzyme activity, as follows: 1. Activity: this test index is very sensitive and most reliable, if the activity is significantly reduced, mainly consider suffering from G6PD enzyme deficiency caused by fava bean disease, the usual medication needs to pay attention to avoid using non-steroidal anti-inflammatory drugs, grow up to eat less fava beans.