I VERY MUCH doubt it will anything you've done! Posts from other people seem to suggest that severe SA can be a problem around the 1 year mark. Perhaps there was a trigger? In my case a change of environment coupled with going back to work and learning to walk seemed to set him off. (Many people point to a link between beginning to walk and this sort of behaviour). They're going through a lot developmentally around one year old which can interfere with sleep. How is your DD at nap time? I think it's yet another phase but all the harder as both our children had been STTN. I always find myself kicking against these phases when they come before getting the stamina to wait them out from somewhere...! I found the book 'Wonder Weeks' really helpful and comforting - perhaps you might too - it explains these developmental 'leaps' that lead to a change in behaviour better than I can.
http://www.thewonderweeks.com I will be interested to hear how things go for you.
For what it's worth, at first I dealt with the NWs by bringing him into bed with me/DH kicked out! but that isn't sustainable and I worry about causing a bad habit. So I tried picking him up every time, he would calm immediately, but cry again as soon as I put him down. He would be up and down like a yo yo and repeated walking in and out seemed to set him off again even worse. I tried staying with him and not picking him up, just rubbing his back and shhhhing until he calmed, but as soon as I left the room, he'd start up again. Sounds familiar? Last night as the crying was less intense and intermittent, I went in at 5, then 10, then 15, then 20 mins for an hour to reassure him and he eventually self settled. I think it might be a case of being consistent with what you try, and waiting the phase out, however hard this is. You feel so helpless. Other advice from people seems to be to stick with the routine that worked before this phase began - it's hard not to worry that they're UT or OT and you should start to tweak awake times/nap times etc. etc.
