A 15-day-old baby who has difficulty in having a bowel movement may be constipated, which can be improved by helping the baby’s lifestyle and eating habits, breastfeeding as much as possible, and medication to improve constipation. The 15-day-old baby has difficulty in defecating, you can feed the baby warm water between meals, to increase water intake to improve constipation, but also help the baby massage the abdomen, through the massage of the abdomen to increase gastrointestinal tract peristalsis to improve constipation. As breastmilk is more easily absorbed by babies, you can reduce the intake of formula milk if necessary and breastfeed your baby to provide him with nutrients to improve his constipation. In addition, probiotic preparations such as Bacillus subtilis diphtheriae can be given to your baby or you can use corkscrew to improve constipation. Difficulty in defecation in 15 days old babies may also be caused by congenital megacolon, intestinal stenosis, etc. It is recommended to consult a doctor to find out the cause of the problem in order to avoid delay. The above medications should be used in accordance with medical advice.