Infant sleep grunting may be related to environmental factors, physiological factors, or may be caused by colds, indigestion and other factors. 1. Environmental factors, if the temperature of the environment is high or too noisy during the baby’s sleep, it may affect the baby’s sleep and appear this symptom. 2. Physiological factors, if the sleep during the urine, hungry may appear this situation, at the same time the baby’s nervous system is not yet fully developed, may produce the baby sleep grunting symptoms. 3. Colds, if the baby has a cold, the body fever after the cold may cause the baby to sleep uneasily, so the symptoms of sleep whimpering will appear. 4. Indigestion, some babies eat too much at once, and after indigestion occurs, the gastrointestinal tract becomes bloated and this symptom may occur. There may be other reasons for babies to whimper in their sleep, so it is recommended to go to the hospital in time for a complete examination to clarify the cause of the disease and then give targeted treatment or therapy under the guidance of the doctor.