my baby head has pressed one side what should I do for a proper shape

A. Avoid making your child sleep on that side because when parents make the child sleep constantly on one side the head becomes flat so I must tell you that if you avoid making your child sleep on that side and use other two sides and use a hollow pillow it will help because nothing is going to touch the bed then the head will be in elevated position and it will help in getting the head in its shape