Human pacifier?

Diana
Is anyone else finding their newborn using their breasts as pacifiers? My boy is 2 wks (3 on Wednesday) and won't take a regular pacifier. And in the past few days he won't calm or sleep unless he has my boob in his mouth for purely pacifier purposes. I sit there for up to 40 min and he's not drinking of swallowing - just suckling.  
Anyone else going thru this? Does it last? I'm having trouble coping with it.