I had a Baby Bjorn that I almost never used with my 1st. It was uncomfortable for me although she liked it and I've since heard/read that they are not so good. Tried a Hotsling with my new baby-she hates it. She's 3 months old and likes to be upright so I figured an Ergo may do the trick. Tried it out but here's the problem. She's 3 1/2 months but very small-9lbs, 4 oz at last visit. She does not fit in it-her legs don't go to the openings. I thought about getting the infant insert but someone told me that she's probably too old for it even though she's small. That a baby her age will feel too restricted. Anyone have experience with the Ergo that can offer opinions on this? Thanks