Inclusion Criteria:  Age 0-6 years Born at 34-42 weeks of gestation Birth weight>1500g Normal brain function assessment Parents can understand and sign informed consent  Exclusion Criteria:  The mother had severe complications during pregnancy and delivery History of asphyxiation at birth Have congenital structural malformation Have congenital metabolic disease Have major neuropsychiatric diseases such as craniocerebral injury, craniocerebral tumor, epilepsy, autism, intellectual retardation, schizophrenia, etc. Have major or genetic diseases that affect growth, development or cognition Have contraindications to MRI scanning