3-year-old baby like to lie on the ground have physiological and pathological reasons, the former may be lack of security, the latter may be gastrointestinal discomfort, etc., can adjust the diet to improve. 3-year-old baby is still in the stage of growth and development, psychological and physiological are not fully mature, like to lie on the ground is generally due to the lack of basic behavioral recognition or lack of security, this situation does not require special treatment, at any time to observe the child’s psychological state, to establish a sense of security to get better. If the baby’s diet is not appropriate, resulting in gastrointestinal discomfort, may also have the performance of lying on the ground, this time you need to go to the hospital in time for examination, to prevent malnutrition or serious gastroenteritis, usually pay attention to adjusting the eating habits, light diet, drink more water, to correct the baby’s walking posture. If it can not be improved, it is recommended to consult a doctor in time, under the guidance of the doctor treatment.