Full-term babies do not sleep during the day may be caused by physiological factors such as sleep has been sufficient, insufficient feeding, and may also be caused by functional dyspepsia, colds and other diseases, as well as other diseases such as acute gastroenteritis. 1. Physiological factors: If the baby usually sleeps more, the sleep time may already be sufficient, so the baby does not sleep during the day is normal. In addition, if parents feed their babies too little, it will lead to the phenomenon of hunger, and the baby will also not sleep during the day. 2. Functional dyspepsia: Functional dyspepsia is caused by a combination of factors, including high sensitivity of internal organs and local environment in the stomach. Affected children will have epigastric discomfort, flatulence, loss of appetite, insomnia, etc. They will also have nausea and vomiting. 3. Colds: Colds are mainly caused by viral, bacterial and other pathogenic infections, and children’s main symptoms are coughing, runny nose, sneezing, fever and so on. When the child is not feeling well, it will cause the child to not sleep during the day. 4. other: acute gastroenteritis, intussusception and other diseases can also lead to full-term children do not sleep during the day phenomenon. Full-term babies do not sleep during the day, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.