The 6-month-old baby always makes a strong sound may be normal, mostly related to the imperfect development of the nervous and digestive systems. 1. The baby’s environment in the abdomen is safe and closed, and after birth, there are more external stimuli, coupled with the baby’s neurological development is not complete, and it takes some time to adapt to the external environment, which may result in the emergence of the sound of exerting oneself. 2. After the baby is born, the way of obtaining nutrition changes from relying on the umbilical cord to direct feeding, and the digestive system is not perfect, the burden on the stomach and intestines is heavier, which may lead to the baby twisting the body, making strength and so on. In addition, there may also be diseases and other reasons for the baby to appear abnormal discomfort, parents are advised to pay attention to observation, if the baby appears to be other uncomfortable manifestations of the advice as soon as possible to consult a doctor.