Seven-month-old baby stool dry and hard, considering the existence of constipation, infant constipation, mostly due to poor dietary habits, intestinal peristalsis abnormalities caused. 1. poor diet: intake of food, fresh fruits and vegetables, coarse food intake is too little, daily drinking water is also too little, the baby will appear constipation phenomenon. 2. Abnormal intestinal peristalsis: babies are not very active or less active, resulting in abnormal intestinal peristalsis, which can also lead to constipation. Infants and young children constipation, in addition to the emergence of dry stools, but also can be prolonged intervals between defecation or defecation obstacles to the symptoms. Seven-month-old babies with dry and hard stools may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.