A 26-day-old baby who has not pooped for two days can be seen as a physiologic phenomenon, which is normal. Pathological conditions (such as constipation), is not normal. 1. Physiological phenomenon: for 26 days of the baby, especially formula-fed babies generally 1 ~ 2 days defecation, such as not accompanied by dry stools, defecation difficulties, as well as other discomforts, it is generally considered a normal phenomenon, observation can be. 2. Pathological conditions: If the baby used to defecate 4-6 times a day / day, two days without poop, especially if accompanied by dry stool, affect defecation and other discomforts, usually considered constipation, is not normal, need to intervene, such as oral bacillus subtilis bacillus and other probiotics to regulate. For a 26-day-old baby who has not had a bowel movement for two days, it is recommended to consult a specialist for evaluation and judgment after physiological phenomena have been ruled out. The above medications should be used in accordance with medical advice.