Question
A male infant began mixed feeding due to insufficient breast milk after birth. Initially, he was fed with Conewell and Sanlu milk powder, and later switched to Yili milk powder. The child had diarrhea due to catching a cold and took Similac and pediatric complex chicken gizzard powder. After that, he started experiencing constipation problems, with the frequency of bowel movements gradually extending, and the stool becoming drier. He has not had a bowel movement in the past two days. How should this be handled?