One and a half years old poop three times a day can be seen in physiological phenomena, pathological conditions (such as diarrhea disease), whether it is normal need to be combined with the baby’s condition to determine, such as diarrhea disease is not considered normal. 1. physiological phenomenon: for one and a half year old baby, normal daily defecation 1~2 times, or every other day defecation, there are individual differences, as long as the baby bowel movement regularity, the nature of the stool is normal, usually considered normal, for the baby to defecate three times a day, such as with the previous defecation habits of the difference is not large, and the normal nature of stools, it can be considered normal, but still need to be closely observed. 2. Pathological conditions: such as acute diarrheal disease, there can be an increase in the number of stools, stool changes, for the above phenomenon, such as stools for dilute stools, or the number of bowel movements than the daily bowel movements increased significantly, considering diarrheal disease, it is considered abnormal, need to consult the doctor in a timely manner, improve the relevant examination, a clear diagnosis. If the baby’s stool frequency increases for a long time without relief, or the rate of weight gain is lower than normal, it is recommended to consult a specialist for evaluation and judgment in a timely manner for targeted treatment.