LOVE our ergo!!!
Only used it for newborn with insert for DS2 (and he grew quite quickly into a heavy boy, so not sure how it would go with a little newborn), but we use it weekly still and he is almost 7 months old.
We haven't tried DS1 in it for a while , but he would go nicely on the back I think (must do that soon!!).
Honestly, it is a god send - especially if you have other kids. You'll have your hands free, be comfortable, and have your little bub nice and close!!