The ergo carries on the hip, the back and the front.
There is a newborn insert that goes in it so you can front carry the baby safely from birth through to toddler age.

I have one for Charlotte and it is my favourite carrier - largely because it is the only one she likes! lol

check out the babes in arms website, they are very helpful too so will answer any questions you have about it.

ETA: The Ergo is sort of like a mei tei....as opposed to a Baby Bjorn iykwim.
The Close Carrier goes over both shoulders too if you are after that style, I cant use it now Charlotte is so big, but many people have given it rave reviews cos it is easier than a wrap and super comfy (Apparently lol)