What's the reason for a 2-month-old baby having difficulty defecating?

Aug 24, 2022 Source: Cainiu Health
Disease description:

The baby is now 2 months old. I've noticed that he/she has been having some difficulty with bowel movements over the past couple of days and would like to know what might be causing this.

Doctor's answer (1)
Dr. Xie Zixing
A 2-month-old baby may experience difficulty in defecation due to an immature digestive system or insufficiently developed pelvic floor muscles. It could also result from formula intolerance or a cold abdomen, leading to gastrointestinal dysfunction. Additionally, colorectal disorders in infants can cause such symptoms—for example, Hirschsprung's disease, which is usually caused by the absence of ganglion cells in the intestinal tract.