DD2 is 5 weeks old and wants to be cuddled ALL the time. When she was in SCBU she slept most of the time and self soothed without a problem. When she came home she didn't settle quite as easily but she would at least sleep in her cot. For the past week or so she won't settle in her cot at all. She'll only sleep if one of us is holding her. If we lay her down she wakes up within 10 minutes.
I've read about the fourth trimester and I understand her need for closeness. I'm anxious about continuing with doing this though as I'm worried it's what she'll come to expect and she'll never settle in her cot. I've considered co-sleeping and I'd be happy to do it if I felt there would be an end point but I know so many people who did this and then their baby would never sleep well in their cot.
I've got a sleepyhead which she won't sleep in, a sling which she will sleep in but again, I don't want to set bad habits, I've tried swaddling and rolling up a towel under her sheet to create a nest. We have Ewan the Sheep. None of this makes her happy to sleep on her own 
DD1 is an AWFUL sleeper. Even now at 2.6 she wakes up in the night, although she usually settles quickly once we go to her. Everything DD2 is doing, DD1 did. I don't want to set her on the path of bad habits like we did the first time around.
Help! What can I do?