There is nothing wrong you are doing! I still boob my baby to sleep...I have never been able to do it any other way. Sucking is the most natural way for babies to go to sleep of all ages. I was thinking about this today and I now believe that there is nothing wrong or right in parenting methods, as long as what you do doesn't cause your child distress. So if your child is genuinely distressed by not having boob, bottle, dummy, rocking, singing or whatever you use to get them to sleep, then it is a need and we parents provide our bubbas with what they need. If we do that then NOTHING we do is wrong. Keep up the good work!! It will get better and you need to do what is easier for you and if boob is the way then there is nothing wrong, backward, regressive or whatever the 'baby trainers' would have us think, about it.