Our DS is 2yrs old and this has been the best thing we could've done for him.
Its slightly different for us because he has a single suture down his head, causing it to grow longer rather than wider. We went the medical route to Great Ormond Street Hospital, but the only answer was to actually operate and take the skull off, then put it back together in a rounded shape. Not really what any parent wants to put their child through IMO!!
DS meet all his milestones up until a year old, by which time he was walking. We didn't think it had affected him too badly. When he didn't start to talk (all his mama and dada disappeared at around 13 months) we got worried, he also started head banging. (this was Aug 2003), we got told by HV that it was just a phase etc. (which we believed as we didn't know any better) By the time he was coming up to 2yrs he was a bad sleeper, 8 hrs max, which even then he would wake up every few hours. No one seemed to be helping us. I took him for his 2y/o developmental check and despite the fact he didn't perform throughout the check, the pead still didn't think there was anything wrong. grrr.
We took him to the Osteopath who did an intial assessment. Basically, poor DS had had a tension headache for over a year and had been bashing his head as way of distracting himself from the pain. The osteopath took the history of my pregnancy and his birth and then having examined DS she said she could help us. (they will tell you if they can / can't help! they won't keep you coming just to rip you off!)
We have only needed 7 sessions, at first they were every week to 10 days they are now just once a month .
The results took a few sessions to come through, but we now have a very different little boy. DS has started talking, he sleeps 12 hours minimum through the night unbroken. He is generally a different little boy. (still very much a typical toddler with the occasional big tantrum!)
My only regret? We didn't do it sooner.
HTH and find the solution you are looking for with your DD.