Based on your description, it is common for children who drink formula milk to experience constipation. It is recommended to provide water between meals, perform clockwise abdominal massage daily to promote gastrointestinal movement. At the same time, you can switch to formula milk containing probiotics or provide additional probiotics. Increase the intake of vegetables and fruits in complementary feeding. The patient should also maintain a healthy diet, regular lifestyle, and adjust physical and mental health. In daily life, pay attention to maintaining a good mood, eating light and soft foods, drinking plenty of water, and eating more vegetables and fruits.