My baby is 16 week and has colic. She used to cry for hours every night and I would walk her around in the sling until she passed out from exhaustion. Now she still needs the sling to get to sleep but she cries much much less, sometimes not at all if I keep moving and she is usually asleep in the sling by 7.30. I know this is a really bad habit but we are in survival mode.

My husband now thinks she needs to learn to fall asleep in her crib and that she is just in the habit of using the sling. He is suggesting putting her down and just staying with her, comforting her while she cries, until she falls asleep. I feel like she is still way to young but at the same time something needs to give as I'm an exhausted wreck. She has regressed from falling asleep in sling and me then putting her in her cot to now me having to keep her in the sling all night until I go to bed as she wakes very often crying and I have to jump up and bounce her back to sleep and if I even try to put her in the cot she screams so we have started co sleeping. She has also gone from seeping long stretches to waking every hour. It is crazy. She and I are both utterly exhausted as she doesn't nap either. I'm in tears most days from lack of sleep. She is grumpy all day from being overtired. (She doesn't have reflux as her only symptom of colic is crying. She has no problem sleeping flat etc). What should I do?? I'm desperate! Has anyone done something similar with a 4 month old?