Six-month-old babies always screaming may be physiological phenomenon, may also be caused by night terrors and so on. 1. Physiological phenomenon: six months baby emotional or over-excited, will be through screaming to vent their emotions. In addition, the baby will be alone when insecurity, will also be screaming to attract the attention of parents. These are normal physiological phenomena and do not require treatment. 2. Night terrors: the cause is unknown, and it is considered to be caused by abnormalities and environmental factors. The patient will appear screaming, crying, and accompanied by shortness of breath, strong sense of fear, pupil dilation and other symptoms. If a six-month-old baby develops night terrors, he or she will present as always screaming. Six-month baby always screaming may also have other causes, it is recommended to timely go to the hospital, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.