The baby sleep half an hour to wake up, consider sleep enough, the environment and other physiological factors, may also be acute gastroenteritis, intussusception and other diseases, as well as colds and other diseases lead to. 1. physiological factors: if the baby usually sleep more, will lead to the baby sleep time has been enough, so there will be half an hour of sleep on the phenomenon of waking up. It is also possible that the baby’s sleeping environment is too noisy or the temperature is uncomfortable, which can also cause the baby to wake up after half an hour of sleep. 2. Acute gastroenteritis: acute gastroenteritis is due to bacterial, viral, parasitic and other pathogenic infections, the main symptoms of children with diarrhea, abdominal pain, fever, etc., which will lead to the phenomenon of babies waking up after half an hour of sleep. 3. Intussusception: Intussusception is considered to be caused by peristaltic rhythm disorders of the intestinal tract, and children will have abdominal pain, blood in the stool, vomiting and other symptoms, as well as pallor, abdominal masses and other symptoms, which will also lead to babies waking up after half an hour of sleep. 4. Other: colds, rickets and other diseases can also lead to the baby sleep half an hour wake up performance. Baby sleep half an hour to wake up, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.