Would love to hear from other parents. DD who is 10 weeks old has torticollis and so looks to her right most of the time. So head is misshaped due to this. Dr said it will sort itself out by doing tummy time. However my search of forums says people can expect to shell out up to £2k for special orthotics helmet! 
This is because they are not available on the NHS but still recommended by many parents. Many people say to ignore drs advice if they suggest 'wait it out'.