If a baby has dark circles under the eyes, they may be caused by local skin pigmentation, which is related to the usual diet and long-term exposure to the sun. It may also be due to poor blood circulation, hereditary factors, or abnormal liver and kidney function. If the baby does not rest well and sleep too little, it is likely to cause dark circles under the eyes due to too much fatigue, which can be relieved by rest. If there is no any abnormality, the symptoms of dark circles under the eyes have little effect on the human body and do not require treatment, and if other symptoms appear come to the hospital for further examination.