Lesty, if your carrier hurts, get a new one. The girls on here have heaps of suggestions that you can look at to decide which works for you. Honestly, the hug-a-bub was a lifesaver for me when I had a tiny baby. Your baby will not get in bad habits at such a young age. He has just gone from being held, rocked, comforted 24 hrs a day to a LOT less. Even carrying him around for 12 hrs would be a 50% cut in his world. A more settled and comforted baby usually has less issues around sleeping, etc, as they get older, so whatever works for him!

Hope you get some rest!