There are physiological factors for a 50-day-old baby to always look backward, and it may also be related to disease factors such as hypertonia and abnormal brain development. As 50-day-old babies are curious about things around them, they may appear to look around. In addition, some babies often look back, which may be related to localized hypertonia or abnormal brain development and other disease factors, and may also be accompanied by other symptoms, such as hands often clenched fists, dull gaze and other phenomena, in the occurrence of the above situations, parents need to pay attention to timely to the hospital for relevant examinations. Parents should pay attention to observing the infant’s usual performance, if there are other abnormalities or a decline in mental status, it is necessary to consult a doctor in time to clarify the diagnosis.