Thanks for writing to health care magic.
Pain in the neck could be caused by several problems.
It could be minor most of the time like a muscle problem or a major problem like meningitis
. Infection of the meninges
can cause neck stiffness
. But you have not mentioned any history of poor feeding, vomiting
etc. do not worry.
Is there any history of trauma? Did the child fall some where? If there is no such significant history most cases of stiff neck
could be because of poor posture etc.
Simple analgesics and rest can help to ameliorate the symptoms.
Hope this helps.