Baby carrier that adapts to the morphology and the child's age! I use the crossed straps on the back for a better fit because I'm not off shoulder! It is also super comfortable baby carrier unlike 'normal' I had before! One feels her baby pressed against you (it looks a bit like carrying in a sling with the knot less) My chip is installed in 2 minutes is very convenient! I put it in from 1 ½ months - 2 months! It is certainly expensive but very useful !! Also useful for a mother who lives in a building floor without elevator! This is not my case but I guess the move to each outlet in strollers ... unless you wanted to lose a few extra kilos of pregnancy;)!