More than 20 days of babies have no slag in the stool, if always appear watery stool consider lactose intolerance or acute gastroenteritis and other possibilities. Lactose intolerant babies will appear to eat milk on the situation, lactose is difficult to further digestion and absorption, so the gastrointestinal peristalsis faster, along with the intestinal excretion out. Manifested as watery stools with no food residue, at this time you need to take the baby’s stool, improve the routine stool examination, reducing sugar test. Because lactose is a kind of sugar, generally absorbed in the intestinal tract, there should be no stool. But if the stool reducing sugar strong positive, need to be highly alert to lactose intolerance may be, if for lactose intolerance, oral lactase, or replaced with low-lactose milk powder for feeding. In addition, acute gastroenteritis can also cause the baby to have watery stools without residue, need to be under the guidance of the doctor to replenish fluids and other symptomatic supportive treatment. If there is any abnormality in the baby’s stool, it is recommended to consult a doctor, complete the stool routine and other related examinations and then follow the doctor’s instructions for targeted treatment.