I've spent some time browsing today trying to figure out if Brioche is reasonable in his refusal to leave his cozy home.  The best bit of information I found was:

The baby will come out when the baby is ready to come out." I think in most cases we need to stop hurrying the poor babies and give the mom some love and emotional support.

Guess I'll stop pestering Marina with "is he here yet?, is he here yet?..." and try to enjoy the status quo.  Our life will change enough afterwards, this is a welcome rest period.