2-month-old baby if the head is often tilted back, this is an abnormal posture, normal baby after 3 months, supine position pull up or pick up the baby, the head will actively follow the pull up, hold the baby, his head should be with the direction to come, rather than tilted back. In abnormal cases, the baby will have a pronounced dorsiflexion of the head, that is, the head is tilted back, the head is drooping, the dorsal muscle tension is too high, and in severe cases, it can be called coracobrachial dyskinesia. Often, the baby’s neck can not be completely contacted with the bed when he is in the supine position, and he will be lifted away from it for a certain distance, and this kind of is an abnormal posture, which must be taken seriously by the parents. The main danger is that the baby may have hypertonia and poor head control, which ultimately affects the baby’s gross motor development. This condition is most often seen at birth with hypoxia, asphyxia, or certain congenital neonatal disorders, so it is important to intervene early and treat it early.