J.W.
I highly suggest slings! I had a pouch sling when my daughter was an infant and finally bought an Ergo when she was around 12 mos. I absolutely LOVE the Ergo. At 2 yrs old and 26 lbs I can still put her in there and be comfortable. (not that we really do since she runs around like crazy but I still could if needed) For infants the Ergo sells an infant insert. When my daughter was first born she used the Peg Perego infant car seat. I thought it was rated pretty safe? Its been awhile since I looked at that stuff. We went to put her in her Marathon and it was just TO huge when she was first born. I have no idea how they think a 5lb baby can fit in there. She was 7lb 2 oz and the straps were almost as big as she was.