Babies always eat their hands may be to meet the need to suck, emotional stress, lack of nutrients, mouth ulcers and so on. 1. Satisfy the need for sucking: the sucking reflex is a reflex that babies have since birth, which means that babies will consciously suck when their lips come into contact with the nipple or fingers, so babies always appear to eat their hands. 2. Emotional tension: if the baby is timid, in an unfamiliar environment or when encountering strangers, he may eat his hands to relieve his inner tension, causing the baby to eat his hands all the time. 3. lack of nutrients: when the baby long-term partiality, picky eaters, may lead to a lack of nutrients in the body, caused by the baby eating hand symptoms, and also accompanied by sleep is not solid, yellow hair, eating dirt and other symptoms. 4. Mouth ulcers: If the baby has mouth ulcers in his mouth, he may eat his hands to express the discomfort of the mouth, when parents need to observe whether there are lesions in the child’s mouth. Babies always eat hands to exclude to meet the sucking needs, emotional tension, parents should immediately take the baby to the hospital, improve the relevant examination, clear love eating hands after the cause of active treatment, so as not to delay the condition.