It is not necessarily cerebral palsy if the baby cannot raise his head at 4 months.
There are individual differences in the development of babies. Generally speaking, babies who have reached the age of 1 month can start to hold their heads up, and around the age of 2 months they can raise their heads by 30°~45° in the prone position, and at the age of 4~5 months, their heads can be lifted up by 90° and stably supported.
If the baby is 4 months old and still can’t raise his head, parents can exercise the baby to raise his head appropriately, such as letting the baby lie on the bed, guiding the baby to raise his head to look at things or people, and so on. At the same time, parents should also pay attention to the baby’s condition to see if the baby has any other abnormal behavior.
If the baby still cannot hold his head up stably or does not want to hold his head up all the time at the age of 4~6 months, it should draw parents’ attention and bring the baby to a regular hospital for examination as soon as possible, so that a professional doctor can conduct a detailed analysis and assessment for diagnosis to rule out the possibility of cerebral palsy.