Hello Bubsmaw
Just wanted to share my experience with you.
DS (now nearly 4) started to develop a flattened left side of his head when he was about a month old, he too had a strong preference for sleeping with his head facing towards the left. I think in hindsight he was born witha case of torticollis which if i had known at the time might have responeded to some paed physio.
After some initial research etc we tried repositioning etc but really and truly it was never successful as he would wiggle and move straight back to his original spot. We didnt use wedges simply due to my fear of SIDS etc.
When he was about six months old I became more concerned as he was developing slightly 'bulging' features on that left side of his face, almost as if the bone growth that was trying to happen towards the back of his skull was compensating at the front. We took him to our gp who basically said 'its cosmetic and wont show when he is older'. We did ask for a paed referral but cancelled it as by that time we didnt have the time to wait the 8 weeks or so for it to come through.
Again did a lot of internet research and looked at numerous plagio forums and eventually went to see a lovely lady (very well qualified in her field) down in Cardiff, had DS head scanned (its non invasive, not like a cat scan or anything) and DS was found to have a moderate verging on severe degree of asymmetry. She told us that as far as the (limited) research available indicated, there was about 50% chance of DS plagio improving but that it was impossible to tell if he would be lucky, or indeed how much better it would get, if at all.
We were sent away to think it all over and we made the decision to have him fitted with a 'Starband', which he needed to wear for 5 month. Google it and have a look yourself, but its basically a 'helmet' made specifically to correct the individual childs head. One very important thing to note is that the earlier you begin treatment the less time your child will be in the helmet, 5 months was quite a long treatment time as DS was 8 months when he eventualy went into his.The starband cost about two thousand pounds so not a light undertaking for us, but we did without other things in order to fund it and had a bit of help fopm family.
Ds never ever showed any signs of distress from wearing his and after 5 months his plagio had come down onto the cusp of 'normal', importantly for us his facial asymmetry was completely resolved.
He is a happy healthy little chap and you would have to look extremely closely to notice that he still has a very slightly flat head on the left.
Whether or not to treat is such a personal decision, we did it because we didnt want to look back in years to come and regret not having tried something, so for us acting was better than not acting, if that makes sense.
My stance is also that we would not think twice about getting, say, orthodontic treatment for their DC so why is this seen as different. There have been no reports of any adverse events for babies from wearing their helmets so there is not much of a risk/ benefit analysis to be done, except financial!
Good luck and feel free to post again if you want to know more.