DD four months old, can only sleep on her side. She wakes herself up every 40 mins or so by rolling into her back and it's really hitting hard now. I keep being told that at four months babies should be learning to self soothe but we're nowhere close and I'm worried bad habits will just become more ingrained. I don't know if there's a magic technique I should be trying? Please tell me there is. I don't like the way I'm starting to feel angry towards her. It's not her fault.