My baby is 21 weeks and for the past 6 weeks she's been waking up every 1.5/2hrs through the night! I'm breastfeeding and I know she's just comfort sucking to get back to sleep, we co-sleep (we've done this since day 1 - so much easier for bf), she's never been able to 'self soothe' as we've always rocked/fed her to sleep from day 1. It was the only way to get her to sleep as she was such a fussy baby in the evenings for the first 3/4 months! Anyway, I've managed to get her into a bedtime routine and she falls asleep so much easier now, but still by feeding her. I've tried to give her a dummy but she never takes it (although she will take it from someone when I'm out and they are looking after her!). DH can't even settle her for bed now or naps - I'm losing the will to live!!! So I know I need to do some kind of sleep training but I'm not willing to CIO so wanted to do something with the least amount of crying! Anyway, I'm just wondering if anyone else has used the above for a similar situation and if it was any gd? Seems I'm the only one out of my friends that has experienced this, lucky me! 
Also, should I start on naps first as they're a nightmare too, lasting around 40mins unless I hold her, or do I sort night sleep first? Thanks!