My daughter will be 6 months old next week and she still won't sleep without comfort sucking during the day and night. I start her bedtime routine with a bath at about 7pm with a feed and she'll be asleep by 8.30pm. I am then forced to comfort her when she wakes up with my breast every hour until midnight and again a few times through the night and the morning. She does have some proper feeds in between too.
I've read some books where people mention 'controlled crying' or 'pick up / put down routines' and I've sort of tried both for about 5 minutes but I can't bear her crying so much and I give in. The problem is that I'm becoming so tired with the night wake-ups that I physically feel that I can't do it sometimes. She won't take a bottle but I'm hoping that when she starts eating next week and being weaned off the breast will help but I don't think that'll affect her inability to self-sooth back to sleep.
I know that it's my fault for allowing it to happen but I didn't realise it at the time especially because she was so colicky for the first 3 months and I hadn't really read the 'good routine' books before to know that I shouldn't allow her to sleep that way. 