Indeed, the film has to pass under the roller that is situated a bit apart from the other (rollers). This is a particularity of some Rollei TLR models, and I think the baby is not one of them (I'm sure the "T" is not one either).
The theory is that the rollers are there to sense the thickness of the film and know when it has been advanced to the right place. The advance lever should automatically block when the film has reached the 1st frame. If your camera still refuses to operate normally after passing the film under the right roller, then it's time for service.
My 2,8 F has never made a single error in film advancement in our happy life toghether.