The baby sleep eating thumb may and lack of micronutrients, seek security and other factors related to, can be supplemented by micronutrients, timely appeasement and other ways to improve. 1. lack of trace elements: baby sleep like eating thumb, may be due to the lack of trace elements caused by the body, it is recommended that parents take the baby to the hospital for relevant examinations, clear cause of the disease and then actively targeted supplementation. 2. Seek security: most babies like to eat their hands to sleep, may be caused by a lack of physical security, parents usually need to give enough love and care, before going to bed can be more pat on the back, storytelling and other ways to improve. Baby sleep eating thumbs may also have other reasons, it is recommended to go to the hospital in time for relevant examination, clear cause and then actively for treatment.