I have been bought one of those baby wrap sling things for my 9day old baby, I really want to use it as it's going to make things loads easier! I have watched videos on YouTube on how to use them, I'm just concerned as I don't actually know how tight it should be, I did put baby in it and she seemed happy although I wasn't keen as her legs were on one side, please can someone reassure me and give me any advice at all? Xx