2 years old 8 months baby these days old hand eating common causes include psychological factors, environmental factors, disease factors. 1. Psychological factors: before there has been a long time parent-child separation or weaning too early, resulting in baby anxiety or insecurity, manifested in involuntary hand eating, hand eating can make the baby to relieve anxiety, get a kind of self-comfort. 2. Environmental factors: the environment changes, such as entering the garden, moving house, the baby through eating hands can make his heart calm down, to practice self-regulation. 3. Disease factors: baby finger skin long barbs or lack of zinc, etc., the baby can be manifested as gnawing fingers to relieve discomfort. There may be other reasons for the baby to eat his hands, it is recommended to go to the hospital in time for relevant examinations, clear causes and then actively treat the symptoms.