Quote Originally Posted by George Papantoniou
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.
The mechanism on the Baby is indeed slightly different, but does the same job. There's a little lever on one edge film path which gets tripped by the advancing film, and automatically starts the counting process [on the post war cameras]. (film goes OVER both rollers in this case).

Ian