Affecting 1 in 5 babies. It is due to lying on the back. Premature babies are prone to this.
Change baby position, hold the baby when feeding, change the baby head position. Trying using the Indian sling (saree used as a baby hammock). These measures usually help and over a period of time, it will get better.
Specially designed helmets and headbands are available, but it is cumbersome, costly and lack any clear evidence.