Hi
I'm not sure what the official line is with dummies but personally I gave Olivia a dummy when she was 10 days old. I was ready to give up breastfeeding as my nipples were bleeding and sore, and I didn't have any confidence that I was filling her up as she always seemed to want more! The dummy was our saviour for a while.
My friend recommended me the Tommy Tippeee Nuby Orthodontic Dummies, they move in and out like your breast does when they feed. You can get them from Boots and most other chemists.
Lucy