Dd is 3.5mo and still only sleeps swaddled in her swing seat at night. I've noticed a slight flat spot on the back of her head, and also she is getting wriggly in the swing, ideally I'd like her in the bedside crib that I've just got off my sister. Despite the ranitidine which has helped enormously, she still only manages to lay flat for about 5 mins before being sick or gagging/spluttering. I'm looking at the tucker sling and wedge, as I don't think raising the head end a bit will work as I tried this a couple of weeks ago and she was still sick and slipped down anyway. Has anyone tried one and are they any good?