Infants sleeping during the day and not sleeping at night can generally be adjusted through regular sleep, supplemental calcium and vitamin D, moderate sun exposure and other methods. 1. Regular sleep: this situation may be due to the lack of good sleep habits, you can let the baby to develop good sleep habits, such as a nap at noon every day, but do not take too long, generally keep in 1 ~ 2 hours can be, in the morning and afternoon as far as possible do not let the baby sleep. 2. Moderate sun exposure, supplemental calcium and vitamin D: infants sleep during the day, the night does not sleep may be due to a lack of calcium or vitamin D caused by this situation can let the child appropriate sun exposure, it is recommended to consult with a professional doctor in a timely manner, by the doctor to improve the relevant examination, to determine whether it is necessary to supplement calcium and vitamin D. The above drugs should be used under the guidance of a professional doctor, but not for a long time. All of the above drugs should be used under the guidance of a professional doctor, do not self-medication, in order to avoid adverse effects.