If a newborn does not have stool a day, the following reasons are mainly considered: 1, belongs to the physiological normal phenomenon, common in newborns eat less milk, so there is not enough fecal mass, the child does not have stool a day belongs to normal. Because some newborns stool 2-3 days may come out once, but the child’s stool properties belong to the normal, yellow, soft, no special treatment, parents do not need to worry too much. 2, functional constipation. The reason why the child did not stool a day, is due to intestinal flora disorders, thus causing functional constipation, the child’s stool often belongs to the more dry. You can promptly apply probiotics, such as small Pepcid, Mamie’s Love, etc. These probiotics can regulate the disorder of the child’s intestinal flora, thus helping the discharge of stool.