My 4months old daughter has flat head what should i do?

Alternate positions: Try changing around her crib in her room. Babies often look at a light source, so try flipping her crib. Also do frequent "tummy time" while she is awake, to help her strengthen her back muscles. Have this checked at her six month checkup, if it's not improving, we can fit her with a "molding helmet" by a plastic surgeon.