Gray was the fussiest he has ever been for me- I am sure it's from teething, but nothing was soothing him!!! He was so upset and it was getting quite pitiful. Nursing, changing, burping, rocking... he was not wanting it. I throw on the sling... instantly calmed and quiet, and within about 1 minute- sleeping like a baby. He's resting in my arms right now, swaddled close to me in the sling, and is so beautiful.