A one-and-a-half-year-old baby who says his feet hurt may be related to nutritional element deficiency, trauma, excessive activity and other reasons. 1. Nutritional element deficiency: If the baby is deficient in calcium and other nutrients due to partiality, it can cause symptoms of foot pain. 2. Trauma: If the baby suffers from trauma such as smashing, it can cause foot fracture or soft tissue damage, and the symptoms of foot pain can appear. 3. Excessive activity: Excessive activity can cause muscle fatigue, which can lead to foot pain in babies. Parents are advised to take their babies to the hospital in time to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor, so as not to delay the condition and bring adverse effects to the body.