One and a half year old baby three days a pull can be seen in physiological phenomena, functional constipation and other cases, whether it is normal need to be analyzed according to the baby’s situation, such as functional constipation is not normal, need to intervene. 1. physiological phenomenon: for this age group of babies, such as daily defecation habits for 3 days to relieve a stool, and defecation regularity, defecation process smooth, no blood stools, abdominal discomfort and other symptoms, is generally considered to be a normal physiological phenomenon, you can continue to observe the daily can drink more water, appropriate more dietary fiber intake. 2. constipation: if the baby used to solve 1 ~ 2 times a day stool, the phenomenon described above, often think that the interval between defecation is prolonged, part of the baby can appear difficult to defecate, or due to the phenomenon of dry stool blood, or can also appear abdominal discomfort, often think that this kind of baby there is functional constipation, belong to the abnormal, need to intervene as appropriate. It is recommended that one and a half year old babies pull once every three days in time to consult a specialist physician comprehensive assessment and judgment.