Thanks for your replies, I think I will mention something to her - given he's in the 4-8 month mark where if he does need something done, it should be easier now, rather than doing something later on.

I like the idea of sandwiching it between something nice like Onyx suggested, but my warped sense of humour kicked in and thought 'hey, he's got such cute blue eyes and WTF is going on with his flat head??? and isn't he just so alert... ha ha ha. I think I'll have to work on it. Actually I don't think I'll be catching up with her for awhile, so it will be over email. Harder still but at least I can take my time workshopping something appropriate.
Thanks again and also for the link and the proper term. My mum had mentioned something about a helmet if it's severe, so I'm glad I asked.