Children’s foot pain at night may be related to lactic acid buildup, growing pains, calcium deficiency and so on. 1. Lactic acid buildup: children are more active and play more intense sports during the day, which leads to more lactic acid buildup in the muscles of the feet, resulting in obvious symptoms of foot and leg pain. 2. Growing pains: mostly seen in children with rapid growth and development, may be due to the rapid growth of skeletal muscles, the nerve tissue around the skeletal muscles are pulled due to, often occurring at night, to bilateral knee joints, can also occur in the feet. 3. Calcium deficiency: small children need more calcium due to growth and development, when the body’s calcium supply is insufficient, it may cause foot cramps, but also the phenomenon of foot pain in bed. Children sleeping at night foot pain can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or treatment.